Policyholder Account Balances, Future Policy Benefits and Claims and Separate Account Liabilities (Balances by product) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Policyholder account balances	$ 20,581	$ 20,650
Future policy benefits	9,720	8,180
Policy claims and other policyholders' funds	941	869
Policyholder account balances, future policy benefits and claims	31,242	29,699
Fixed annuities [Member]
Policyholder account balances	10,889	11,239
Variable annuity fixed sub-accounts [Member]
Policyholder account balances	5,060	4,912
VUL/UL insurance [Member]
Policyholder account balances	2,947	2,897
IUL [Member]
Policyholder account balances	910	808
Other life insurance [Member]
Policyholder account balances	775	794
Variable annuity GMWB [Member]
Future policy benefits	2,156	1,057
Variable annuity GMAB [Member]
Future policy benefits	44	0
Other annuity liabilities [Member]
Future policy benefits	120	31
Fixed annuities life contingent liabilities [Member]
Future policy benefits	1,499	1,501
EIA [Member]
Future policy benefits	26	27
Life, disability income and long term care insurance [Member]
Future policy benefits	5,348	5,112
VUL/UL and other life insurance additional liabilities [Member]
Future policy benefits	$ 527	$ 452

The aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies. Also includes the liability as of the balance sheet date for the policyholders funds held that are returnable under the terms of insurance contracts.

No definition available.

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- Definition

The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437

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- Definition

Amount of accrued obligation to policyholders that relates to insured events for long-duration contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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- Definition

The total liability as of the balance sheet date of amounts due policy holders, excluding future policy benefits and claims, including unpaid policy dividends, retrospective refunds, and undistributed earnings on participating business.

+ References

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