Derivative Financial Instruments (Schedule of Income and Comprehensive Income (Loss) Impact of Items Designated as Cash Flow Hedges) (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in accumulated other comprehensive loss	$ (7)	$ (29)	$ 69	$ (26)
Foreign exchange | Advertising
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified into income from accumulated other comprehensive loss	0	2	1	3
Foreign exchange | Distribution
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified into income from accumulated other comprehensive loss	12	2	20	6
Foreign exchange | Cost of Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified into income from accumulated other comprehensive loss	1	0	2	(2)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in accumulated other comprehensive loss	0	(3)	(272)	(18)
Interest rate swaps | Other (expense) income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified into income from accumulated other comprehensive loss	$ 1	$ 0	$ 1	$ 0