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Debt (Schedule of debt instruments) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Debt Instrument [Line Items] |  |
Long term debt | $ 2,779,000,000 | $ 2,776,000,000
Total | $ 2,779,000,000 | 2,776,000,000
3.950%, face amount of $550, due May 15, 2024 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.95% |
Face amount | $ 550,000,000 |
Long term debt | $ 549,000,000 | 548,000,000
4.500%, face amount of $500, due March 1, 2026 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.50% |
Face amount | $ 500,000,000 |
Long term debt | $ 499,000,000 | 499,000,000
3.450%, face amount of $500, due August 15, 2027 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.45% |
Face amount | $ 500,000,000 |
Long term debt | $ 497,000,000 | 496,000,000
3.900%, face amount of $500, due May 1, 2029 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.90% |
Face amount | $ 500,000,000 |
Long term debt | $ 496,000,000 | 496,000,000
2.050%, face amount of $500, due August 15, 2030 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.05% |
Face amount | $ 500,000,000 |
Long term debt | $ 495,000,000 | 495,000,000
Debenture of CNAF, 7.250%, face amount of $243, due November 15, 2023 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 7.25% |
Face amount | $ 243,000,000 |
Long term debt | $ 243,000,000 | $ 242,000,000

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