Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation
Share-based compensation expense	$ 249	$ 214	$ 244
Total income tax benefit recognized related to share-based compensation expense	52	45	51
Total unrecognized compensation cost related to non-vested awards	$ 184
Weighted-average period unrecognized compensation cost expected to be recognized	3 years
Stock option
Share-based Compensation
Share-based compensation expense	$ 16	16	20
Restricted stock
Share-based Compensation
Share-based compensation expense	27	27	24
Restricted stock units and deferred share units
Share-based Compensation
Share-based compensation expense	144	127	108
Liability awards
Share-based Compensation
Share-based compensation expense	$ 62	$ 44	$ 92