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Restructuring (Summary of Accrued Expenses Balance) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		42 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jan. 01, 2026
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 44	$ 55	$ 44		$ 44	$ 53
Restructuring and Related Cost, Incurred Cost	51	47	98	$ 109	795
Payments for Restructuring	(62)	(44)
Restructuring Reserve, Accrual Adjustment	0	(1)
Special Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	33	36	33		33	34
Restructuring and Related Cost, Incurred Cost	0	5
Payments for Restructuring	(3)	(3)
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	8	15	8		$ 8	$ 15
Restructuring and Related Cost, Incurred Cost	51	42
Payments for Restructuring	(58)	(41)
Restructuring Reserve, Accrual Adjustment	$ 0	$ (1)
International Operated Markets
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			1
International Developmental Licensed Markets and Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			$ 97