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Benefit Plans (Fair Value of Plan Assets Measured on a Recurring Basis) (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 2,577 | $ 2,420 | $ 2,285
Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,577 | 2,420 |
Total | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,719 | 1,664 |
Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 777 | 699 |
Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 934 | 956 |
Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 9 |
Fair Value Measured at Net Asset Value Per Share | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 838 | 756 |
Fair Value Measured at Net Asset Value Per Share | Fair Value, Recurring | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 20 |  |
Total fixed maturity securities trading | Total | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 793 | 782 |
Total fixed maturity securities trading | Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Total fixed maturity securities trading | Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 785 | 773 |
Total fixed maturity securities trading | Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 9 |
Corporate and other bonds | Total | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 653 | 652 |
Corporate and other bonds | Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Corporate and other bonds | Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 645 | 643 |
Corporate and other bonds | Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 9 |
States, municipalities and political subdivisions | Total | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 30 | 32 |
States, municipalities and political subdivisions | Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
States, municipalities and political subdivisions | Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 30 | 32 |
States, municipalities and political subdivisions | Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Asset-backed | Total | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 110 | 98 |
Asset-backed | Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Asset-backed | Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 110 | 98 |
Asset-backed | Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Equity securities | Total | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 873 | 803 |
Equity securities | Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 732 | 666 |
Equity securities | Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 141 | 137 |
Equity securities | Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Short term investments | Total | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 45 | 58 |
Short term investments | Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 45 | 20 |
Short term investments | Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 38 |
Short term investments | Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other assets | Total | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 8 |
Other assets | Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other assets | Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 8 |
Other assets | Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Cash | Total | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 13 |
Cash | Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 13 |
Cash | Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Cash | Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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