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Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]    
Other comprehensive income (loss) before reclassifications $ 20 $ 36
Changes in derivative financial instruments, net of tax 4 13
Changes in derivative financial instruments, tax $ 1 $ 4