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Reinsurance (Consolidated Reinsurance) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Premiums written [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | $ 34,782 | $ 33,137 | $ 31,543
Assumed |  |  |  |  |  |  |  |  | 3,186 | 3,239 | 3,440
Ceded |  |  |  |  |  |  |  |  | (7,389) | (7,132) | (6,838)
Net |  |  |  |  |  |  |  |  | 30,579 | 29,244 | 28,145
Premiums earned [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | 34,108 | 32,782 | 31,811
Assumed |  |  |  |  |  |  |  |  | 3,175 | 3,332 | 3,744
Ceded |  |  |  |  |  |  |  |  | (7,219) | (7,080) | (6,806)
Net premiums earned | $ 7,465 | $ 7,908 | $ 7,664 | $ 7,027 | $ 7,218 | $ 7,807 | $ 7,237 | $ 6,772 | 30,064 | 29,034 | 28,749
Reinsurance recoveries on losses and loss expenses incurred |  |  |  |  |  |  |  |  | $ 5,600 | $ 5,500 | $ 4,100

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