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Reinsurance - Insurance Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Premiums Earned |  |  |
Direct | $ 14,204 | $ 14,031 | $ 13,811
Assumed | 678 | 368 | 395
Ceded | (650) | (627) | (654)
Net earned premiums, fees and other considerations | 15,121 | 14,554 | 14,361
Property and Casualty Insurance Products |  |  |
Premiums Written |  |  |
Direct | 10,865 | 10,906 | 10,861
Assumed | 223 | 253 | 297
Ceded | (571) | (591) | (580)
Net | 10,517 | 10,568 | 10,578
Premiums Earned |  |  |
Direct | 10,923 | 10,871 | 10,704
Assumed | 232 | 261 | 298
Ceded | (600) | (583) | (586)
Net | 10,555 | 10,549 | 10,416
Group Benefits |  |  |
Premiums Earned |  |  |
Gross earned premiums, fees and other considerations | 3,281 | 3,160 | 3,107
Assumed | 446 | 107 | 97
Ceded | (50) | (44) | (68)
Net earned premiums, fees and other considerations | $ 3,677 | $ 3,223 | $ 3,136

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