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Reinsurance - Insurance Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Premiums Earned |  |  |
Direct | $ 14,439 | $ 14,204 | $ 14,031
Assumed | 2,265 | 678 | 368
Ceded | (660) | (650) | (627)
Net earned premiums, fees and other considerations | 17,182 | 15,309 | 14,738
Group Benefits |  |  |
Premiums Earned |  |  |
Gross earned premiums, fees and other considerations | 3,615 | 3,281 | 3,160
Assumed | 2,044 | 446 | 107
Ceded | (61) | (50) | (44)
Net earned premiums, fees and other considerations | 5,598 | 3,677 | 3,223
Property and Casualty Insurance Products |  |  |
Premiums Written |  |  |
Direct | 10,784 | 10,865 | 10,906
Assumed | 217 | 223 | 253
Ceded | (593) | (571) | (591)
Net | 10,408 | 10,517 | 10,568
Premiums Earned |  |  |
Direct | 10,824 | 10,923 | 10,871
Assumed | 221 | 232 | 261
Ceded | (599) | (600) | (583)
Net | $ 10,446 | $ 10,555 | $ 10,549

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