Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation
Share-based compensation expense	$ 244	$ 213	$ 188
Total income tax benefit recognized related to share-based compensation expense	51	45	40
Total unrecognized compensation cost related to non-vested awards	$ 148
Weighted-average period unrecognized compensation cost expected to be recognized	3 years 1 month 6 days
Stock option
Share-based Compensation
Share-based compensation expense	$ 20	23	31
Restricted stock
Share-based Compensation
Share-based compensation expense	24	24	22
Restricted Stock Units
Share-based Compensation
Share-based compensation expense	108	99	82
Liability awards
Share-based Compensation
Share-based compensation expense	$ 92	$ 67	$ 53

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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