Fair Value Measurements - Guaranteed Living Benefits (Details 5) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	$ 646	$ 1,005
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	(959)	(1,518)
Level 1 [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	0	2
Level 1 [Member] | Variable Annuity Hedging Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	0	0
Level 1 [Member] | Macro hedge program [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	0	2
Level 1 [Member] | Reinsurance Recoverable for U.S. GMWB [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	0	0
Level 1 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	0	(2)
Level 1 [Member] | U.S. guaranteed withdrawal benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	0	0
Level 1 [Member] | International guaranteed withdrawal benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	0	0
Level 1 [Member] | International other guaranteed living benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis		0
Level 1 [Member] | Variable Annuity Hedging Derivatives [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	0	0
Level 1 [Member] | Macro hedge program [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	0	(2)
Level 2 [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	55	54
Level 2 [Member] | Variable Annuity Hedging Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	(33)	(122)
Level 2 [Member] | Macro hedge program [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	88	176
Level 2 [Member] | Reinsurance Recoverable for U.S. GMWB [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	0	0
Level 2 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	40	(11)
Level 2 [Member] | U.S. guaranteed withdrawal benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	0	0
Level 2 [Member] | International guaranteed withdrawal benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	0	0
Level 2 [Member] | International other guaranteed living benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis		0
Level 2 [Member] | Variable Annuity Hedging Derivatives [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	(86)	(11)
Level 2 [Member] | Macro hedge program [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	126	0
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	591	949
Level 3 [Member] | Variable Annuity Hedging Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	177	461
Level 3 [Member] | Macro hedge program [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	177	208
Level 3 [Member] | Reinsurance Recoverable for U.S. GMWB [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	237	280
Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	(999)	(1,505)
Level 3 [Member] | U.S. guaranteed withdrawal benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	(1,420)	(1,611)
Level 3 [Member] | International guaranteed withdrawal benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	(30)	(36)
Level 3 [Member] | International other guaranteed living benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis		3
Level 3 [Member] | Variable Annuity Hedging Derivatives [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	371	139
Level 3 [Member] | Macro hedge program [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	80	0
U.S. guaranteed withdrawal benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	(1,420)	(1,611)
International guaranteed withdrawal benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	(30)	(36)
International other guaranteed living benefits [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis		3
Variable Annuity Hedging Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	144	339
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	285	128
Macro hedge program [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	265	386
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Liabilities related to guaranteed living benefits program accounted for at fair value on recurring basis	206	(2)
Reinsurance Recoverable for U.S. GMWB [Member]
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]
Assets related to guaranteed living benefits program accounted for at fair value on recurring basis	$ 237	$ 280