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Quarterly Results (Unaudited) Level 4 (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 4,537	$ 4,695	$ 4,677	$ 4,391	$ 4,513	$ 4,562	$ 4,685	$ 4,617	$ 18,300	$ 18,377	$ 18,614
Benefits, Losses and Expenses	4,812	4,167	4,507	4,010	4,009	4,183	4,215	3,992	17,496	16,399	16,915
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	(81)	438	216	323	421	372	413	467	896	1,673	1,349
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	0	0	0	0	9	0	0	0	9	(551)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (81)	$ 438	$ 216	$ 323	$ 421	$ 381	$ 413	$ 467	$ 896	$ 1,682	$ 798
Earnings Per Share, Basic	$ (0.22)	$ 1.14	$ 0.55	$ 0.81	$ 1.03	$ 0.92	$ 0.99	$ 1.11	$ 2.31	$ 4.05	$ 1.81
Earnings Per Share, Diluted	$ (0.22)	$ 1.12	$ 0.54	$ 0.79	$ 1.01	$ 0.90	$ 0.96	$ 1.08	$ 2.27	$ 3.96	$ 1.73
Weighted Average Number of Shares Outstanding, Basic	376.6	383.8	391.8	398.5	406.9	413.8	418.7	422.6	387.7	415.5	441.8
Weighted Average Number of Shares Outstanding, Diluted	383.8	390.5	398.6	406.3	415.9	423.0	428.1	433.7	394.8	425.2	460.2

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