| Investments In Available-For-Sale Securities And Other Cost Investments (Available-for-sale Securities, Including Fair Value Option Securities Separately Aggregated, and Other Cost Investments) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | |||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014
 Other Investments [Member] | Dec. 31, 2013
 Other Investments [Member] | Mar. 31, 2014
 AFS and cost method investments | Dec. 31, 2013
 AFS and cost method investments | Mar. 31, 2014
 Live Nation
 Debt Securities | Dec. 31, 2013
 Live Nation
 Debt Securities | Jun. 30, 2014
 Subsequent Event
 Barnes & Noble, Inc. | May 01, 2014
 Subsequent Event
 Barnes & Noble, Inc. | Mar. 31, 2014
 Fair Value Option Securities | Dec. 31, 2013
 Fair Value Option Securities | Mar. 31, 2014
 Fair Value Option Securities
 Time Warner Inc
 Equity Securities | Dec. 31, 2013
 Fair Value Option Securities
 Time Warner Inc
 Equity Securities | Mar. 31, 2014
 Fair Value Option Securities
 Time Warner Cable Inc
 Equity Securities | Dec. 31, 2013
 Fair Value Option Securities
 Time Warner Cable Inc
 Equity Securities | Mar. 31, 2014
 Fair Value Option Securities
 Viacom, Inc.
 Equity Securities | Dec. 31, 2013
 Fair Value Option Securities
 Viacom, Inc.
 Equity Securities | Mar. 31, 2014
 Fair Value Option Securities
 Barnes & Noble, Inc.
 Equity Securities | Dec. 31, 2013
 Fair Value Option Securities
 Barnes & Noble, Inc.
 Equity Securities | Mar. 31, 2014
 Fair Value Option Securities
 Other AFS Equity Securities
 Equity Securities | Dec. 31, 2013
 Fair Value Option Securities
 Other AFS Equity Securities
 Equity Securities | Mar. 31, 2014
 Fair Value Option Securities
 Other AFS Debt Securities
 Debt Securities | Dec. 31, 2013
 Fair Value Option Securities
 Other AFS Debt Securities
 Debt Securities | |||||||||||||
| Schedule of Investments [Line Items] | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | ||||||||||||
| Investments in available-for-sale securities and other cost investments | $ 1,299 | $ 1,324 | $ 39 | $ 47 | $ 63 | $ 71 | $ 24 | $ 24 | 听 | 听 | $ 1,236 | $ 1,253 | $ 278 | [1] | $ 297 | [1] | $ 324 | [1] | $ 320 | [1] | $ 309 | [1] | $ 317 | [1] | $ 259 | [2] | $ 255 | [2] | $ 40 | $ 37 | $ 26 | $ 27 | ||||
| Sale of stock, ownership percentage of cost investment after transaction | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 2.00% | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | ||||||||||||
| Percentage of shares sold | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 90.00% | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | ||||||||||||
| Proceeds from sale of AFS | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | $ 250 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | ||||||||||||
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