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Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Intangible Assets [Line Items]      
Non-amortizable intangible assets $ 18,810us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill $ 20,067us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill  
Amortizable intangible assets 2,525us-gaap_FiniteLivedIntangibleAssetsGross 2,852us-gaap_FiniteLivedIntangibleAssetsGross  
Total intangible assets, gross 21,335us-gaap_IntangibleAssetsGrossExcludingGoodwill 22,919us-gaap_IntangibleAssetsGrossExcludingGoodwill 23,269us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated amortization (1,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (925)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Intangible assets, net $ 20,335us-gaap_IntangibleAssetsNetExcludingGoodwill $ 21,994us-gaap_IntangibleAssetsNetExcludingGoodwill