Financial Instruments - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
After-tax loss on interest rate swaps included in interest and other expense, net	$ 79
Pre-tax loss on interest rate swaps included in interest and other expense, net	103	$ 0
Net loss on equity method investment transactions	(71)	$ (23)
Net investment hedge contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	6,652		$ 6,864
Net investment hedge contracts | Net investment hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	6,700
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	4,250		$ 5,250
Interest rate contracts | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Expected transfers of unrealized losses to earnings, within next 12 months or less	$ 19
Hedged forecasted transaction period	4 years 6 months