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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effects of Reinsurance [Line Items] |  |  |
Direct premiums written | $ 6,862 | $ 7,044 | $ 6,626
Reinsurance assumed | 225 | 255 | 214
Reinsurance ceded | (2,074) | (1,957) | (1,817)
Net written premiums | 5,013 | 5,342 | 5,023
Direct premiums earned | 6,846 | 6,848 | 6,472
Reinsurance assumed | 237 | 226 | 204
Reinsurance ceded | (1,984) | (1,889) | (1,811)
Net earned premiums | 5,099 | 5,185 | 4,865
Reinsurance recoveries | $ 1,522 | $ 1,404 | $ 1,249

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