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Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Intangible Assets [Line Items]    
Non-amortizable intangible assets $ 18,017us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill $ 18,810us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Amortizable intangible assets 2,407us-gaap_FiniteLivedIntangibleAssetsGross 2,525us-gaap_FiniteLivedIntangibleAssetsGross
Total intangible assets, gross 20,424us-gaap_IntangibleAssetsGrossExcludingGoodwill 21,335us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated amortization (990)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (1,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, net $ 19,434us-gaap_IntangibleAssetsNetExcludingGoodwill $ 20,335us-gaap_IntangibleAssetsNetExcludingGoodwill