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Recent Accounting Developments - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Reclassification from accumulated other comprehensive income to retained earnings $ 17  
ASU 2016-02 [Member]    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Minimum lease payments under non cancelable operating lease   $ 429
Lessee, operating lease term   12 months