Benefit Plans - Schedule of Rollforward of Level 3 Plan Assets (Details) - Pension benefits - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in plan assets
Fair value of plan assets, beginning of year	$ 4,430	$ 6,525
Fair value of plan assets, end of year	4,440	4,430	$ 6,525
Significant unobservable inputs (Level 3)
Change in plan assets
Fair value of plan assets, beginning of year	0	2	2
Relating to assets sold during the period	0	0	0
Relating to assets still held at the reporting date	0	0	0
Purchases, sales and settlements, net	0	0	0
Net transfers in (out) of Level 3	0	(2)	0
Fair value of plan assets, end of year	0	0	2
Significant unobservable inputs (Level 3) \| Equity securities
Change in plan assets
Fair value of plan assets, beginning of year	0	2	0
Relating to assets sold during the period	0	0	0
Relating to assets still held at the reporting date	0	0	0
Purchases, sales and settlements, net	0	0	2
Net transfers in (out) of Level 3	0	(2)	0
Fair value of plan assets, end of year	$ 0	0	2
Significant unobservable inputs (Level 3) \| Corporate
Change in plan assets
Fair value of plan assets, beginning of year		$ 0	2
Relating to assets sold during the period			0
Relating to assets still held at the reporting date			0
Purchases, sales and settlements, net			(2)
Net transfers in (out) of Level 3			0
Fair value of plan assets, end of year			$ 0

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

+ References

+ Details

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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.

+ References

No definition available.

+ Details

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-Section 50
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-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

+ References

+ Details

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.

+ References

+ Details

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