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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effects of Reinsurance [Line Items] |  |  |
Direct premiums written | $ 6,626 | $ 6,310 | $ 5,858
Reinsurance assumed | 214 | 192 | 123
Reinsurance ceded | (1,817) | (1,751) | (1,595)
Net written premiums | 5,023 | 4,751 | 4,386
Direct premiums earned | 6,472 | 6,112 | 5,745
Reinsurance assumed | 204 | 157 | 118
Reinsurance ceded | (1,811) | (1,690) | (1,535)
Net earned premiums | 4,865 | 4,579 | 4,328
Reinsurance recoveries | $ 1,249 | $ 1,379 | $ 810

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