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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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