Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Operating lease asset	$ 573
Operating lease liability	694
Operating lease cost	121
Variable lease cost	19
Short term lease cost	6
Lease Expense	146	$ 120	$ 113
Lease liability cash payments	117
Operating lease right of use assets obtained in exchange for lease obligations	$ 54