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Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Intangible Assets [Line Items]    
Non-amortizable intangible assets $ 18,272 $ 18,810
Amortizable intangible assets 2,460 2,525
Total intangible assets, gross 20,732 21,335
Accumulated amortization (1,055) (1,000)
Intangible assets, net $ 19,677 $ 20,335