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Insurance - Reinsurance information table including assumed, ceded, and recoveries (Details) - Property and casualty insurance - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effects of Reinsurance [Line Items] |  |  |
Direct premiums written | $ 7,700 | $ 6,862 | $ 7,044
Reinsurance assumed | 246 | 225 | 255
Reinsurance ceded | (2,373) | (2,074) | (1,957)
Net written premiums | 5,573 | 5,013 | 5,342
Direct premiums earned | 7,462 | 6,846 | 6,848
Reinsurance assumed | 249 | 237 | 226
Reinsurance ceded | (2,307) | (1,984) | (1,889)
Net earned premiums | 5,404 | 5,099 | 5,185
Reinsurance recoveries | $ 1,478 | $ 1,522 | $ 1,404

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