Share-Based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Shares
Outstanding at beginning of period (in shares)	762,000	810,000	852,000
Granted (in shares)	0	0	0
Exercised (in shares)	0	0	(23,000)
Expired or cancelled (in shares)	(52,000)	(48,000)	(19,000)
Outstanding at end of period (in shares)	710	762,000	810,000
Exercisable (in shares)	710,000	730,000	706,000
Wtd. Avg. Exercise Price Per Share
Outstanding at beginning of period (in dollars per share)	$ 91	$ 90	$ 90
Exercised (in dollars per share)			76
Expired or cancelled (in dollars per share)	77	80	109
Outstanding at end of period (in dollars per share)	92	91	90
Exercisable (in dollars per share)	$ 92	$ 91	$ 90
Wtd. Avg. Remaining Contractual Term and Aggregate Intrinsic Value
Outstanding (in years)	2 years 10 months 24 days	3 years 8 months 12 days	4 years 4 months 24 days
Exercisable (in years)	2 years 10 months 24 days	3 years 6 months	4 years 1 month 6 days
Outstanding	$ 0	$ 0	$ 1
Exercisable	$ 0	$ 0	$ 1