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Reinsurance - Insurance Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Premiums Earned |  |  |
Direct | $ 18,867 | $ 17,796 | $ 16,132
Assumed | 696 | 927 | 1,988
Ceded | (1,381) | (1,269) | (1,027)
Premiums Earned, Net | 17,999 | 17,288 | 16,923
Property and Casualty Insurance Products |  |  |
Premiums Written |  |  |
Direct | 13,696 | 12,537 | 12,190
Assumed | 631 | 577 | 371
Ceded | (1,378) | (1,209) | (978)
Net | 12,949 | 11,905 | 11,583
Premiums Earned |  |  |
Direct | 13,204 | 12,551 | 12,010
Assumed | 568 | 540 | 416
Ceded | (1,277) | (1,173) | (936)
Premiums Earned, Net | 12,495 | 11,918 | 11,490
Group Insurance Policy [Member] |  |  |
Premiums Earned |  |  |
Direct | 5,663 | 5,245 | 4,122
Assumed | 128 | 387 | 1,572
Ceded | (104) | (96) | (91)
Premiums Earned, Net | $ 5,687 | $ 5,536 | $ 5,603

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