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Restructuring (Summary of Accrued Expenses Balance) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		33 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Jan. 01, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 50	$ 60	$ 73	$ 50		$ 50	$ 42
Restructuring and Related Cost, Incurred Cost	43	43	66	152	$ 146	623
Payments for Restructuring	(53)	(59)	(36)
Restructuring Reserve, Accrual Adjustment	0	3	1
Special Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	31	29	35	31		31	23
Restructuring and Related Cost, Incurred Cost	4	(3)	17
Payments for Restructuring	(2)	(3)	(5)
Restructuring Reserve, Accrual Adjustment	0	0	0
Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	3	3	4	3		3	4
Restructuring and Related Cost, Incurred Cost	0	0	0
Payments for Restructuring	0	(1)	0
Restructuring Reserve, Accrual Adjustment	0	0	0
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	16	28	34	16		$ 16	$ 15
Restructuring and Related Cost, Incurred Cost	39	46	49
Payments for Restructuring	(51)	(55)	(31)
Restructuring Reserve, Accrual Adjustment	$ 0	$ 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				$ 138