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Accounting Standards - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other assets $ 719 $ 412
Long-term debt $ 2,394 2,327
Accounting Standards Update No. 2015-03 | Restatement Adjustment [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other assets   (19)
Long-term debt   $ (19)