Variable Interest Entities (Total Assets of Consolidated VIEs) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Consolidated VIEs for Which the Company is the Investment Manager
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	$ 10,253	$ 7,828
Total liabilities of consolidated VIEs	9,271	6,732
Consolidated VIEs for Which the Company is the Investment Manager \| Fixed maturities, available-for-sale
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	0	44
Consolidated VIEs for Which the Company is the Investment Manager \| Fixed maturities, held-to-maturity
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	0	0
Consolidated VIEs for Which the Company is the Investment Manager \| Trading account assets supporting insurance liabilities
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	0	0
Consolidated VIEs for Which the Company is the Investment Manager \| Other trading account assets
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	9,536	6,943
Consolidated VIEs for Which the Company is the Investment Manager \| Commercial mortgage and other loans
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	0	13
Consolidated VIEs for Which the Company is the Investment Manager \| Other long-term investments
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	0	0
Consolidated VIEs for Which the Company is the Investment Manager \| Cash and cash equivalents
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	337	623
Consolidated VIEs for Which the Company is the Investment Manager \| Accrued investment income
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	56	39
Consolidated VIEs for Which the Company is the Investment Manager \| Other assets
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	324	166
Consolidated VIEs for Which the Company is the Investment Manager \| Notes issued by consolidated VIEs
Variable Interest Entity [Line Items]
Total liabilities of consolidated VIEs	8,597	6,058
Consolidated VIEs for Which the Company is the Investment Manager \| Other liabilities
Variable Interest Entity [Line Items]
Total liabilities of consolidated VIEs	674	674
Other Consolidated VIEs
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	1,411	1,340
Total liabilities of consolidated VIEs	3	1
Other Consolidated VIEs \| Fixed maturities, available-for-sale
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	179	104
Other Consolidated VIEs \| Fixed maturities, held-to-maturity
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	760	763
Other Consolidated VIEs \| Trading account assets supporting insurance liabilities
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	10	11
Other Consolidated VIEs \| Other trading account assets
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	0	0
Other Consolidated VIEs \| Commercial mortgage and other loans
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	300	300
Other Consolidated VIEs \| Other long-term investments
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	155	159
Other Consolidated VIEs \| Cash and cash equivalents
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	1	0
Other Consolidated VIEs \| Accrued investment income
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	3	3
Other Consolidated VIEs \| Other assets
Variable Interest Entity [Line Items]
Total assets of consolidated VIEs	3	0
Other Consolidated VIEs \| Notes issued by consolidated VIEs
Variable Interest Entity [Line Items]
Total liabilities of consolidated VIEs	0	0
Other Consolidated VIEs \| Other liabilities
Variable Interest Entity [Line Items]
Total liabilities of consolidated VIEs	$ 3	$ 1

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5710-111685

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