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v3.20.4

Reinsurance (Reinsurance on premiums - short-duration contracts) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earned Premiums [Abstract] |  |  |
Premiums | $ 1,395 | $ 2,224 | $ 2,467
Property and casualty [Member] |  |  |
Written Premiums [Abstract] |  |  |
Direct written premiums |  | 864 | 1,101
Ceded written premiums |  | (23) | (55)
Total net written premiums |  | 841 | 1,046
Earned Premiums [Abstract] |  |  |
Direct earned premiums |  | 841 | 1,124
Ceded earned premiums |  | (24) | (94)
Premiums |  | $ 817 | $ 1,030

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