Restructuring and Other Charges,Net - Activity and Reserve Balances for Restructuring Charges (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	$ 137	$ 47
Restructuring and other charges, net	43	212
Cash payments	(71)	(118)
Reversals and other	(4)	(4)
Restructuring reserve ending balance	105	137
Severance and Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	35	5
Restructuring and other charges, net	19	51
Cash payments	(28)	(19)
Reversals and other	(1)	(2)
Restructuring reserve ending balance	25	35
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	102	42
Restructuring and other charges, net	24	161
Cash payments	(43)	(99)
Reversals and other	(3)	(2)
Restructuring reserve ending balance	$ 80	$ 102