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Restructuring (Summary of Accrued Expenses Balance) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		30 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jan. 01, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 60	$ 73	$ 60		$ 60	$ 42
Restructuring and Related Cost, Incurred Cost	43	66	109	$ 101	580
Payments for Restructuring	(59)	(36)
Restructuring Reserve, Accrual Adjustment	3	1
Special Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	29	35	29		29	23
Restructuring and Related Cost, Incurred Cost	(3)	17
Payments for Restructuring	(3)	(5)
Restructuring Reserve, Accrual Adjustment	0	0
Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	3	4	3		3	4
Restructuring and Related Cost, Incurred Cost	0	0
Payments for Restructuring	(1)	0
Restructuring Reserve, Accrual Adjustment	0	0
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	28	34	28		$ 28	$ 15
Restructuring and Related Cost, Incurred Cost	46	49
Payments for Restructuring	(55)	(31)
Restructuring Reserve, Accrual Adjustment	$ 3	$ 1
International Operated Markets
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			14
International Developmental Licensed Markets and Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			$ 95