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Stock Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Stock options
Stock Compensation Plans:
Stock options granted in period (shares)	35,300	16,900	1,482,600	1,375,300
Award vesting period			3 years
Award expiration period			10 years
Unrecognized compensation cost	$ 255		$ 255
Remaining period over which to recognize unrecognized compensation expense			2 years
Restricted stock
Stock Compensation Plans:
Awards other than stock options granted in period (shares)	0	0	11,500	13,400
Award vesting period			1 year
Unrecognized compensation cost	$ 2		$ 2
Remaining period over which to recognize unrecognized compensation expense			7 months
Restricted stock units
Stock Compensation Plans:
Awards other than stock options granted in period (shares)	21,600	14,100	1,205,100	1,113,900
Award vesting period			3 years
Unrecognized compensation cost	$ 452		$ 452
Remaining period over which to recognize unrecognized compensation expense			2 years

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