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Reinsurance Level 4 Insurance Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Policyholder Benefits and Claims Incurred, Ceded | $ 0 | $ 0 | $ 502
Insurance Recoveries | 1,145 | 1,111 | 863
Premiums Earned, Net [Abstract] |  |  |
Direct Premiums Earned | 16,553 | 16,471 | 16,560
Assumed Premiums Earned | 497 | 507 | 457
Ceded Premiums Earned | 2,234 | 2,293 | 2,419
Premiums Earned, Net, Life | 14,816 | 14,685 | 14,598
Life Insurance Product Line [Member] |  |  |
Premiums Earned, Net [Abstract] |  |  |
Gross Fee Income Earned Premium and Other Life | 5,682 | 5,767 | 6,029
Assumed Premiums Earned | 236 | 209 | 193
Ceded Premiums Earned | 1,651 | 1,707 | 1,720
Premiums Earned, Net, Life | 4,267 | 4,269 | 4,502
Property, Liability and Casualty Insurance Product Line [Member] |  |  |
Premiums Written, Net [Abstract] |  |  |
Direct Premiums Written | 10,906 | 10,861 | 10,571
Assumed Premiums Written | 253 | 297 | 275
Ceded Premiums Written | (591) | (580) | (602)
Premiums Written, Net | 10,568 | 10,578 | 10,244
Premiums Earned, Net [Abstract] |  |  |
Direct Premiums Earned | 10,871 | 10,704 | 10,531
Assumed Premiums Earned | 261 | 298 | 264
Ceded Premiums Earned | 583 | 586 | 699
Premiums Earned, Net, Property and Casualty | $ 10,549 | $ 10,416 | $ 10,096

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