Stock-Based Compensation (Summary of Stock Awards Outstanding) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
RSU awards
Schedule Of Shares Awarded [Abstract]
Shares granted (in thousands)	670	654	673
Fair value (in millions)	$ 65	$ 64	$ 59
Shares
Outstanding at beginning of period (in shares)	1,097
Granted (in shares)	670	654	673
Vested (in shares)	(548)
Forfeited (in shares)	(104)
Outstanding at end of period (in shares)	1,115	1,097
Stock awards expected to vest (in shares)	1,064
Weighted Average Grant Date Fair Value
Weighted average fair value at beginning of period (usd per share)	$ 95
Granted (usd per share)	97
Vested (usd per share)	95
Forfeited (usd per share)	96
Weighted average fair value at end of period (usd per share)	96	$ 95
Weighted average fair value of awards expected to vest (usd per share)	$ 96
Performance awards
Schedule Of Shares Awarded [Abstract]
Shares granted (in thousands)	422	408	380
Fair value (in millions)	$ 42	$ 40	$ 33
Shares
Outstanding at beginning of period (in shares)	1,033
Granted (in shares)	422	408	380
Vested (in shares)	(298)
Forfeited (in shares)	(42)
Outstanding at end of period (in shares)	1,115	1,033
Stock awards expected to vest (in shares)	1,086
Weighted Average Grant Date Fair Value
Weighted average fair value at beginning of period (usd per share)	$ 97
Granted (usd per share)	100
Vested (usd per share)	105
Forfeited (usd per share)	98
Weighted average fair value at end of period (usd per share)	96	$ 97
Weighted average fair value of awards expected to vest (usd per share)	$ 96

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The number of equity-based payment instruments, excluding stock (or unit) options, that are expected to vest.

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No definition available.

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The weighted average fair value of expected to vest awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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No definition available.

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- Definition

Share Based Compensation Grants In Period Fair Value

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No definition available.

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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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- Definition

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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

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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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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- Definition

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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