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Insurance - Reinsurance information table including assumed, ceded, and recoveries (Details) - Property and casualty insurance - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effects of Reinsurance [Line Items] |  |  |
Direct premiums written | $ 7,044 | $ 6,626 | $ 6,310
Reinsurance assumed | 255 | 214 | 192
Reinsurance ceded | (1,957) | (1,817) | (1,751)
Net written premiums | 5,342 | 5,023 | 4,751
Direct premiums earned | 6,848 | 6,472 | 6,112
Reinsurance assumed | 226 | 204 | 157
Reinsurance ceded | (1,889) | (1,811) | (1,690)
Net earned premiums | 5,185 | 4,865 | 4,579
Reinsurance recoveries | $ 1,404 | $ 1,249 | $ 1,379

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