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Goodwill and Other Intangible Assets - Changes in Intangible Assets Other Than Goodwill (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Other Intangible Assets [Roll Forward]    
Amortizing Intangible Assets, Beginning Balance $ 730us-gaap_FiniteLivedIntangibleAssetsNet $ 1,028us-gaap_FiniteLivedIntangibleAssetsNet
Finite-lived Intangible Assets Acquired 50us-gaap_FinitelivedIntangibleAssetsAcquired1 [1] 19us-gaap_FinitelivedIntangibleAssetsAcquired1 [1]
Impairment of Intangible Assets, Finite-lived (2)us-gaap_ImpairmentOfIntangibleAssetsFinitelived (150)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Amortization of Intangible Assets (133)us-gaap_AmortizationOfIntangibleAssets (165)us-gaap_AmortizationOfIntangibleAssets
Amortizing Intangible Assets, Other (9)us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease (2)us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease
Amortizing Intangible Assets, Ending Balance 636us-gaap_FiniteLivedIntangibleAssetsNet 730us-gaap_FiniteLivedIntangibleAssetsNet
Other Non-Amortizing Intangible Assets, Beginning Balance 2,758us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 2,958us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Other Non-Amortizing Intangible Assets, Impairment (240)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill (200)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Indefinite-lived Intangible Assets, Period Increase (Decrease) (4)us-gaap_IndefiniteLivedIntangibleAssetsPeriodIncreaseDecrease 0us-gaap_IndefiniteLivedIntangibleAssetsPeriodIncreaseDecrease
Other Non-Amortizing Intangible Assets, Ending Balance 2,514us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 2,758us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Intangible assets other than goodwill, Beginning Balance 3,488us-gaap_IntangibleAssetsNetExcludingGoodwill 3,986us-gaap_IntangibleAssetsNetExcludingGoodwill
Finite-lived Intangible Assets Acquired 50us-gaap_FinitelivedIntangibleAssetsAcquired1 [1] 19us-gaap_FinitelivedIntangibleAssetsAcquired1 [1]
Impairment of Intangible Assets (Excluding Goodwill) (242)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill (350)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
Amortization of Intangible Assets (133)us-gaap_AmortizationOfIntangibleAssets (165)us-gaap_AmortizationOfIntangibleAssets
Increase (Decrease) in Intangible Assets, Current (13)us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent (2)us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent
Intangible assets other than goodwill, Ending Balance $ 3,150us-gaap_IntangibleAssetsNetExcludingGoodwill $ 3,488us-gaap_IntangibleAssetsNetExcludingGoodwill
[1] During 2014, we increased our amortizing intangible assets $50 million, primarily as a result of the Pacific Interactive acquisition (see Note 6, “Acquisitions, Dispositions, and Other Property Matters”). During 2013, we increased our amortizing intangible assets $19 million as a result of entering into certain contractual arrangements.