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Employee Benefit Plans (Changes in Fair Value of Level 3 Pension and Post Retirement Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Level 3 | Corporate Bond Securities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Plan assets at beginning of period | $ 0 | $ 0
Actual return on assets: |  |
Relating to assets still held at the reporting date | 0 | 0
Relating to assets sold during the period | 0 | 0
Purchases | 12 | 0
Sales | (3) | 0
Issuances | 0 | 0
Settlements | 0 | 0
Transfers in and/or out of Level 3 | 0 | 0
Plan assets at end of period | 9 | 0
Postretirement |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Plan assets at beginning of period | 1,191 | 1,621
Actual return on assets: |  |
Plan assets at end of period | 1,186 | 1,191
Other | Level 3 | Fixed Maturities |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Plan assets at beginning of period | 65 | 42
Actual return on assets: |  |
Relating to assets still held at the reporting date | 0 | 0
Relating to assets sold during the period | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Issuances | 82 | 65
Settlements | (65) | (42)
Transfers in and/or out of Level 3 | 0 | 0
Plan assets at end of period | 82 | 65
Partnerships | Level 3 | Real Estate |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Plan assets at beginning of period | 1,004 | 998
Actual return on assets: |  |
Relating to assets still held at the reporting date | (57) | 56
Relating to assets sold during the period | 0 | 0
Purchases | (5) | (50)
Sales | 0 | 0
Issuances | 0 | 0
Settlements | 0 | 0
Transfers in and/or out of Level 3 | 0 | 0
Plan assets at end of period | 942 | 1,004
Partnerships | Level 3 | Other invested assets |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Plan assets at beginning of period | 1,713 | 1,800
Actual return on assets: |  |
Relating to assets still held at the reporting date | 197 | (92)
Relating to assets sold during the period | 0 | 0
Purchases | 232 | 5
Sales | 0 | 0
Issuances | 0 | 0
Settlements | 0 | 0
Transfers in and/or out of Level 3 | 0 | 0
Plan assets at end of period | 2,142 | 1,713
Hedge Fund | Level 3 | Other invested assets |  |
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Plan assets at beginning of period | 1,455 | 1,304
Actual return on assets: |  |
Relating to assets still held at the reporting date | 121 | 33
Relating to assets sold during the period | 0 | 0
Purchases | (81) | 118
Sales | 0 | 0
Issuances | 0 | 0
Settlements | 0 | 0
Transfers in and/or out of Level 3 | 0 | 0
Plan assets at end of period | $ 1,495 | $ 1,455

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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 sold. + 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 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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