Shareholders' Equity - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Rate of options exercisable per year, commencing one year after grant	20% per year commencing one year after grant
Duration of options expiration, after date of grant	10 years
Total intrinsic value of options exercised	$ 88	$ 17	$ 46
Cash received from the exercise of stock options	58	14	31
Tax benefit related to exercise of stock options	14	3	8
Total compensation expense related to stock incentive plans	16	20	23
Tax benefit related to compensation costs	$ 19	9	13
Share-based payment arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock reserved for issuance under stock incentive plans (shares)	2,700,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock vesting period	4 years
Restricted Common Stock vested during period, fair value	$ 28	$ 19	$ 11
Weighted average period of cost expected to be recognized	2 years 6 months
Unrecognized compensation expense related to equity-based awards that have yet to vest	$ 30
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to equity-based awards that have yet to vest	$ 0

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

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