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Share-Based Compensation Plans - Summary of Restricted Stock Activity (Details) - Restricted Stock - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Unvested at beginning of period (in shares)	484,000	446,000	396,000
Granted (in shares)	208,000	200,000	236,000
Vested (in shares)	(124,000)	(145,000)	(150,000)
Forfeited (in shares)	(23,000)	(17,000)	(36,000)
Unvested at end of period (in shares)	545,000	484,000	446,000	396,000
Wtd. Avg. Price Per Share
Unvested at beginning of period (in dollars per share)	$ 94	$ 97	$ 92
Granted (in dollars per share)	87	92	84
Vested (in dollars per share)	106	95	76
Forfeited (in dollars per share)	84	93	93
Unvested at end of period (in dollars per share)	$ 85	$ 94	$ 97	$ 92
Equity Other Than Options, Additional [Abstract]
Unvested (in years)	1 year 3 months 18 days	1 year 4 months 24 days	1 year 6 months	1 year 3 months 18 days
Unvested, aggregate intrinsic value	$ 53

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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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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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