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Stock Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Stock Compensation Plans (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Stock options
Stock Compensation Plans:
Stock options granted in period (shares)	39,600	13,800	1,447,300	1,358,400
Award vesting period			3 years
Award expiration period			10 years
Unrecognized compensation cost	$ 312		$ 312
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)	11,500	13,400	11,500	13,400
Award vesting period			1 year
Unrecognized compensation cost	$ 3		$ 3
Remaining period over which to recognize unrecognized compensation expense			10 months
Restricted stock units
Stock Compensation Plans:
Awards other than stock options granted in period (shares)	28,300	16,700	1,183,500	1,099,800
Award vesting period			3 years
Unrecognized compensation cost	$ 551		$ 551
Remaining period over which to recognize unrecognized compensation expense			2 years