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Significant Accounting Policies (Narrative) (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) segment business_unit | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Jan. 01, 2021 segment
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Core business segments, number | segment |  |  | 2 | 3 |  | 2
Goodwill impairment |  | $ 62,000,000 | $ 0 | $ 99,000,000 | $ 0 |
Intangible assets |  |  | $ 708,000,000 | 683,000,000 |  |
Period in years that unrecognized actuarial net gains (losses) are being recognized |  |  | 22 years |  |  |
Period of recognition (no greater than) |  |  | 5 years |  |  |
Retained earnings |  |  | $ 1,260,000,000 | 1,305,000,000 |  |
Adjustment |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Retained earnings | $ (3,000,000) |  |  |  |  |
Tax | $ 1,000,000 |  |  |  |  |
Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite lived intangible assets useful lives |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite lived intangible assets useful lives |  |  | 25 years |  |  |
Government Solutions |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of business units | business_unit |  |  | 4 |  |  |
Goodwill impairment |  |  |  | $ 0 |  |

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