Equity (Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Realized investment gains (losses), net	$ 609		$ (1,024)		$ 817		$ (1,747)
Other Income reclassified from AOCI	267		(1,823)		802		(3,827)
Cash Flow Interest Rates Hedges [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Realized investment gains (losses), net	(6)	[1],[2],[3]	(8)	[1],[2],[3]	(12)	[1],[2],[3]	(12)	[1],[2],[3]
Cash Flow Currency Interest Rate Hedges [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Realized investment gains (losses), net	(6)	[1],[2],[3]	(26)	[1],[2],[3]	(10)	[1],[2],[3]	(44)	[1],[2],[3]
Available-for-sale Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Realized investment gains (losses), net	536	[1],[2]	384	[1],[2]	878	[1],[2]	514	[1],[2]
Joint Ventures And Limited Partnerships [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Realized investment gains (losses), net	0	[1],[2]	0	[1],[2]	0	[1],[2]	66	[1],[2]
Foreign Currency Translation Adjustment [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Realized investment gains (losses), net	1	[1],[2]	1	[1],[2]	2	[1],[2]	0	[1],[2]
Reclassification From Accumulated Other Comprehensive Income Current Period BeforeTax	1	[1],[2]	1	[1],[2]	2	[1],[2]	0	[1],[2]
Pension and Postretirement Unrecognized Net Periodic Benefit (Cost) [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassification From Accumulated Other Comprehensive Income Current Period BeforeTax					(46)		(63)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassification From Accumulated Other Comprehensive Income Current Period BeforeTax	524	[1],[2],[4]	350	[1],[2],[4]	856	[1],[2],[4],[5]	524	[1],[2],[4],[5]
Accumulated Other Comprehensive Income (loss) [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassification From Accumulated Other Comprehensive Income Current Period BeforeTax	501	[1],[2]	319	[1],[2]	812	[1],[2]	461	[1],[2]
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service costs reclassed from AOCI	5	[1],[2],[6]	5	[1],[2],[6]	11	[1],[2],[6]	11	[1],[2],[6]
Amortization of actuarial gain (loss), net reclassed from AOCI	(29)	[1],[2],[6]	(37)	[1],[2],[6]	(57)	[1],[2],[6]	(74)	[1],[2],[6]
Reclassification From Accumulated Other Comprehensive Income Current Period BeforeTax	(24)	[1],[2]	(32)	[1],[2]	(46)	[1],[2]	(63)	[1],[2]
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Accumulated Other Comprehensive Income (loss) [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassification From Accumulated Other Comprehensive Income Current Period BeforeTax					$ 812

[1] All amounts are shown before tax.

[2] Positive amounts indicate gains/benefits reclassified out of AOCI. Negative amounts indicate losses/costs reclassified out of AOCI.

[3] See Note 14 for additional information on cash flow hedges.

[4] See table below for additional information on unrealized investment gains (losses), including the impact on deferred policy acquisition and other costs, future policy benefits and policyholders’ dividends.

[5] Includes cash flow hedges of $(533) million and $(446) million as of June 30, 2014 and December 31, 2013, respectively, and $(98) million and $(257) million as of June 30, 2013 and December 31, 2012, respectively.

[6] See Note 10 for information on employee benefit plans.