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Accounting Standards - Additional Information (Detail) - USD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2019
Operating lease liabilitites   $ 1,826
Operating lease right of use assets   $ 1,811
Accounting Standards Update 2016-02 [Member]    
Cumulative impact adjustments to retained earnings $ 25  
Operating lease liabilitites 1,800  
Operating lease right of use assets $ 1,800