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Employee Benefit Plans - Narrative (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) plan | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 0 | $ 0 | $ 0
Expected contributions expected in the next fiscal year | $ 0 |  |
Percentage within which the planned allocation is managed | 5.00% |  |
Investments at Fair Value | $ 2,327,000,000 | 3,016,000,000 |
Growth-Oriented |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation percentage of pension plan assets | 60.00% |  |
Investments at Fair Value | $ 1,434,000,000 | 1,812,000,000 |
Immunizing |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation percentage of pension plan assets | 40.00% |  |
Investments at Fair Value | $ 893,000,000 | 1,204,000,000 |
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial gain (loss) | $ 570,000,000 | $ 142,000,000 |
Increase (decrease) in weighted average discount rate | 2.24% | 0.35% |
Investments at Fair Value | $ 2,327,000,000 | $ 3,016,000,000 | 3,000,000,000
Pre-tax (loss) gain to be amortized related to post-retirement obligations | (727,000,000) |  |
Expense associated with savings plans | 28,000,000 | 29,000,000 | 39,000,000
Plan benefit accruals | 2,368,000,000 | 3,022,000,000 | 3,257,000,000
Defined benefit plan, service cost | 32,000,000 | 41,000,000 | 43,000,000
Accumulated Benefit Obligation | $ 2,285,000,000 | 2,909,000,000 |
Pension Plan | Quality Carriers, Inc. | Multiemployer Plan, Union-represented Employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of multi-employer pension plans | plan | 3 |  |
Contingent liability for full withdrawal or termination of multi-employer plan | $ 336,000,000 |  |
Pension Plan | Quality Carriers, Inc. | Multiemployer Plan, Union-represented Employees, Central Southeast And Southwest Areas Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contingent liability for full withdrawal or termination of multi-employer plan | 328,000,000 |  |
Postretirement Health Coverage |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expected future benefit payments | 55,000,000 |  |
Accumulated Benefit Obligation | 61,000,000 | 81,000,000 |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Premium expense incurred under the plan | $ 13,000,000 | $ 21,000,000 | $ 20,000,000

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