Share-based Compensation Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	35,600
Performance Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	6,700
Number of units
Outstanding non-vested at December 31 (in shares)	6,700
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	400
Number of units
Outstanding non-vested at December 31 (in shares)	400
Restricted Stock Units (RSUs) | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	33.33%
Restricted Stock Units (RSUs) | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	33.33%
Restricted Stock Units (RSUs) | Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	33.33%
Restricted Stock Units (RSUs) and Performance Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	6,695	5,088
Share-based payment arrangement, expense	$ 127	$ 100	$ 140
Number of units
Outstanding non-vested at January 1 (in shares)	5,088
Granted (in shares)	5,314
Vested (in shares)	(3,291)
Forfeited (in shares)	(416)
Outstanding non-vested at December 31 (in shares)	6,695	5,088
Weighted-average grant date fair value per share
Outstanding non-vested at January 1 (in dollars per share)	$ 40.83
Granted (in dollars per share)	29.91
Vested (in dollars per share)	34.60
Forfeited (in dollars per share)	34.56
Outstanding non-vested at December 31 (in dollars per share)	$ 35.68	$ 40.83