Investments and Derivative Instruments (Details 11) (USD $)	Jun. 30, 2014	Dec. 31, 2013
GMWB reinsurance contracts
Notional amount	$ 94,451,000,000	$ 159,441,000,000
Fair Value	(538,000,000)	(737,000,000)
Interest Rate Swap [Member]
GMWB reinsurance contracts
Notional amount	10,800,000,000	6,900,000,000
International Program Hedging Instruments [Member]
GMWB reinsurance contracts
Notional amount	0	73,048,000,000
Fair Value	0	(33,000,000)
International Program Hedging Instruments [Member] | Other Credit Derivatives [Member]
GMWB reinsurance contracts
Notional amount		350,000,000
Fair Value		5,000,000
International Program Hedging Instruments [Member] | Stock Option [Member]
GMWB reinsurance contracts
Notional amount		3,051,000,000
Fair Value		(30,000,000)
International Program Hedging Instruments [Member] | Foreign Exchange Forward [Member]
GMWB reinsurance contracts
Notional amount		13,410,000,000
Fair Value		(60,000,000)
International Program Hedging Instruments [Member] | Currency Options [Member]
GMWB reinsurance contracts
Notional amount		12,066,000,000
Fair Value		(54,000,000)
International Program Hedging Instruments [Member] | Equity Futures [Member]
GMWB reinsurance contracts
Notional amount		999,000,000
Fair Value		0
International Program Hedging Instruments [Member] | Equity Swap [Member]
GMWB reinsurance contracts
Notional amount		4,269,000,000
Fair Value		(119,000,000)
International Program Hedging Instruments [Member] | Interest Rate Futures [Member]
GMWB reinsurance contracts
Notional amount		952,000,000
Fair Value		0
International Program Hedging Instruments [Member] | Interest Rate Swaps and Swaptions [Member]
GMWB reinsurance contracts
Notional amount		37,951,000,000
Fair Value		225,000,000
UNITED STATES | GMWB hedging instruments [Member]
GMWB reinsurance contracts
Notional amount	15,543,000,000	18,691,000,000
Fair Value	73,000,000	41,000,000
UNITED STATES | Macro Hedge Program [Member]
Derivative [Line Items]
Derivative_positions_offsetting_foreign_currency_forwards_and_equity_index_swaps	19.9
GMWB reinsurance contracts
Notional amount	5,248,000,000	9,934,000,000
Fair Value	120,000,000	139,000,000
UNITED STATES | Macro Hedge Program [Member] | Stock Option [Member]
GMWB reinsurance contracts
Notional amount	4,374,000,000	9,934,000,000
Fair Value	120,000,000	139,000,000
UNITED STATES | Customized swaps [Member] | GMWB hedging instruments [Member]
GMWB reinsurance contracts
Notional amount	7,514,000,000	7,839,000,000
Fair Value	64,000,000	74,000,000
UNITED STATES | Equity swaps, options and futures [Member] | GMWB hedging instruments [Member]
GMWB reinsurance contracts
Notional amount	4,104,000,000	4,237,000,000
Fair Value	16,000,000	44,000,000
UNITED STATES | Interest rate swaps and futures [Member] | GMWB hedging instruments [Member]
GMWB reinsurance contracts
Notional amount	3,925,000,000	6,615,000,000
Fair Value	(7,000,000)	(77,000,000)
JAPAN | Macro Hedge Program [Member] | Foreign Exchange Option [Member]
GMWB reinsurance contracts
Notional amount	874,000,000	0
Fair Value	0	0
Long [Member] | UNITED STATES | Macro Hedge Program [Member]
Derivative [Line Items]
Derivative_positions_offsetting_foreign_currency_forwards_and_equity_index_swaps	9.8
Short [Member] | UNITED STATES | Macro Hedge Program [Member]
Derivative [Line Items]
Derivative_positions_offsetting_foreign_currency_forwards_and_equity_index_swaps	10.1
Net Hedge Position [Member] | International Program Hedging Instruments [Member] | Foreign Exchange Forward [Member]
GMWB reinsurance contracts
Notional amount		(1,800,000,000)
Long Hedge Position [Member] | International Program Hedging Instruments [Member] | Foreign Exchange Forward [Member]
GMWB reinsurance contracts
Notional amount		5,800,000,000
Short Hedge Position [Member] | International Program Hedging Instruments [Member] | Foreign Exchange Forward [Member]
GMWB reinsurance contracts
Notional amount		$ 7,600,000,000