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Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Other comprehensive income (loss) before reclassifications $ 18 $ (223) $ 38 $ (187)
Changes in derivative financial instruments, net of tax 3 (14) 7 (1)
Changes in derivative financial instruments, tax $ 1 $ 5 $ 2 $ 0