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				9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in accumulated other comprehensive loss	$ (19)		$ 41		$ 50	$ 15
Foreign exchange | Advertising
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified into income from accumulated other comprehensive loss	0		1		1	4
Foreign exchange | Distribution
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified into income from accumulated other comprehensive loss	5		(5)		25	1
Foreign exchange | Cost of Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified into income from accumulated other comprehensive loss	0		3		2	1
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in accumulated other comprehensive loss	53		0		(219)	(18)
Interest rate swaps | Other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified into income from accumulated other comprehensive loss	$ 0		$ 3		0	3
Interest rate swaps | Interest expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified into income from accumulated other comprehensive loss		$ 0		$ (1)	$ 1	$ (1)