Stock-Based Compensation - Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Unrecognized Compensation	$ 53
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at January 1 (in shares)	3,187	2,845	3,559
Outstanding at January 1 (in dollars per share)	$ 26.48	$ 26.87	$ 29.51
Granted (in shares)	1,513	2,028	1,366
Granted (in dollars per share)	$ 23.37	$ 27.85	$ 23.22
Vested (in shares)	(1,327)	(1,473)	(1,666)
Vested (in dollars per share)	$ 26.07	$ 28.85	$ 29.28
Cancelled/expired (in shares)	(212)	(213)	(414)
Cancelled/expired (in dollars per share)	$ 25.06	$ 28.39	$ 27.85
Outstanding at December 31 (in shares)	3,161	3,187	2,845	3,559
Outstanding at December 31 (in dollars per share)	$ 25.26	$ 26.48	$ 26.87	$ 29.51
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Unrecognized Compensation	$ 40
Remaining Weighted-Average Vesting Period (Years)	1 year 5 months 19 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at January 1 (in shares)	2,425	2,830	2,462
Outstanding at January 1 (in dollars per share)	$ 26.67	$ 24.99	$ 29.83
Granted (in shares)	1,195	901	1,433
Granted (in dollars per share)	$ 24.67	$ 37.59	$ 19.46
Vested (in shares)	(672)	(993)	(633)
Vested (in dollars per share)	$ 28.08	$ 31.94	$ 29.56
Cancelled/expired (in shares)	(130)	(313)	(432)
Cancelled/expired (in dollars per share)	$ 26.92	$ 26.22	$ 27.50
Outstanding at December 31 (in shares)	2,818	2,425	2,830	2,462
Outstanding at December 31 (in dollars per share)	$ 25.47	$ 26.67	$ 24.99	$ 29.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Unrecognized Compensation	$ 13
Remaining Weighted-Average Vesting Period (Years)	1 year 8 months 12 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1 (in shares)	799	861	1,022
Outstanding at January 1 (in dollars per share)	$ 27.81	$ 27.83	$ 27.84
Granted (in shares)	0	0	0
Granted (in dollars per share)	$ 0	$ 0	$ 0	$ 5.71
Canceled/expired (in shares)	(187)	(60)	(92)
Canceled/expired (in dollars per share)	$ 27.97	$ 27.98	$ 27.92
Exercised (in shares)	0	(2)	(69)
Exercised (in dollars per share)	$ 0	$ 27.98	$ 27.98
Outstanding at December 31 (in shares)	612	799	861	1,022
Outstanding at December 31 (in dollars per share)	$ 27.77	$ 27.81	$ 27.83	$ 27.84
Exercisable at December 31 (in shares)	612	470	233
Exercisable at December 31 (in dollars per share)	$ 27.77	$ 27.84	$ 27.83
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Granted (in shares)			351
Granted (in dollars per share)			$ 28.51
Over-performance of 2018 PSU grant
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Granted (in shares)	60

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of share options (or share units) exercised during the current period.

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Weighted average price of options that were exercised.

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