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Income Taxes - Schedule of Provision for Income Taxes on Income from Continuing Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 0 $ 0 $ 0
Foreign 133 115 70
State and local 1 (1) 1
Current provision for income taxes, total 134 114 71
Deferred:      
Federal 1,208 196 67
Foreign 136 29 37
State and local (2)   (1)
Deferred provision for income taxes, total 1,125 34 (35)
Provision for income taxes (R) $ 1,476 $ 339 $ 174