Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Fair Value Measurement [Domain]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	$ 113,585,000,000		$ 111,634,000,000
Fair Value Measurement [Domain] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	73,539,000,000		71,606,000,000
Fair Value Measurement [Domain] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	38,882,000,000		38,856,000,000
Fair Value Measurement [Domain] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	277,000,000		201,000,000
Available-for-sale Securities, Debt Securities	56,326,000,000		56,003,000,000
Trading Securities, Equity	11,000,000		11,000,000
Available-for-sale Securities, Equity Securities	1,223,000,000		1,097,000,000
Short-term investments	4,595,000,000		3,244,000,000
Alternative Investments, Fair Value Disclosure	2,418,000,000		2,456,000,000
Reinsurance recoverable for U.S. GMWB	23,405,000,000		23,311,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	4,491,000,000	$ 4,184,000,000	4,422,000,000	$ 3,911,000,000
Separate Account Assets	116,582,000,000		115,665,000,000
Assets, Fair Value Disclosure	176,276,000,000		172,243,000,000
Marketable Securities, Fixed Maturities	160,000,000		293,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	(902,000,000)		(988,000,000)
Derivative Liability, Fair Value, Amount Offset Against Collateral	19,000,000		56,000,000
HIG_FairValueAssetsLevel2ToLevel1TransfersAmounts	0	0
Business Combination, Contingent Consideration, Liability	60
ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,265,000,000		2,382,000,000
Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,311,000,000		1,916,000,000
CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	5,099,000,000		4,936,000,000
Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	25,730,000,000		25,666,000,000
Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,187,000,000		1,171,000,000
Municipal [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	11,780,000,000		11,486,000,000
RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	3,921,000,000		4,767,000,000
U.S. Treasuries [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	4,033,000,000		3,679,000,000
Liabilities, Fair Value Disclosure [Abstract]
HIG_FairValueAssetsLevel1ToLevel2TransfersAmount	0	0
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	688,000,000		620,000,000
Trading Securities, Equity	11,000,000		11,000,000
Available-for-sale Securities, Equity Securities	936,000,000		821,000,000
Short-term investments	2,077,000,000		878,000,000
Assets, Fair Value Disclosure	77,251,000,000		73,937,000,000
Marketable Securities, Fixed Maturities	0		1,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	0		0
Level 1 [Member] | ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | Municipal [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0
Level 1 [Member] | U.S. Treasuries [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	688,000,000		620,000,000
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	51,768,000,000		51,573,000,000
Trading Securities, Equity	0		0
Available-for-sale Securities, Equity Securities	188,000,000		177,000,000
Short-term investments	2,518,000,000		2,366,000,000
Assets, Fair Value Disclosure	93,675,000,000		92,960,000,000
Marketable Securities, Fixed Maturities	160,000,000		281,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	(711,000,000)		(736,000,000)
Level 2 [Member] | ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,140,000,000		2,300,000,000
Level 2 [Member] | Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,992,000,000		1,502,000,000
Level 2 [Member] | CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	4,982,000,000		4,856,000,000
Level 2 [Member] | Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	24,652,000,000		24,586,000,000
Level 2 [Member] | Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,121,000,000		1,107,000,000
Level 2 [Member] | Municipal [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	11,663,000,000		11,368,000,000
Level 2 [Member] | RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,873,000,000		2,795,000,000
Level 2 [Member] | U.S. Treasuries [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	3,345,000,000		3,059,000,000
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	3,870,000,000		3,810,000,000
Trading Securities, Equity	0		0
Available-for-sale Securities, Equity Securities	99,000,000		99,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(219,000,000)		(299,000,000)	(288,000,000)
Short-term investments	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	277,000,000	154,000,000	201,000,000	139,000,000
Assets, Fair Value Disclosure	4,463,000,000		4,375,000,000
Marketable Securities, Fixed Maturities	0		11,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	(191,000,000)		(252,000,000)
Level 3 [Member] | ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	125,000,000		82,000,000
Level 3 [Member] | Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	319,000,000		414,000,000
Level 3 [Member] | CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	117,000,000		80,000,000
Level 3 [Member] | Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,078,000,000		1,080,000,000
Level 3 [Member] | Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	66,000,000		64,000,000
Level 3 [Member] | Municipal [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	117,000,000		118,000,000
Level 3 [Member] | RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,048,000,000		1,972,000,000
Level 3 [Member] | U.S. Treasuries [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other policyholder funds and benefits payable [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(193,000,000)	(386,000,000)	(274,000,000)	(288,000,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	76,000,000		52,000,000
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,038,000,000		1,963,000,000
Liability [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(193,000,000)		(274,000,000)
Liability [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0		0
Liability [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0		0
Liability [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(193,000,000)		(274,000,000)
Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(26,000,000)		(25,000,000)
Obligations [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(26,000,000)		(25,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(26,000,000)	(386,000,000)	(25,000,000)
Equity Linked Notes [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(36,000,000)		(33,000,000)
Equity Linked Notes [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0		0
Equity Linked Notes [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0		0
Equity Linked Notes [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure			(33,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(36,000,000)	(25,000,000)	(33,000,000)	(26,000,000)
US GMWB Hedging Instruments [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	80,000,000		74,000,000
US GMWB Hedging Instruments [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	3,000,000		20,000,000
US GMWB Hedging Instruments [Member] | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
US GMWB Hedging Instruments [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
US GMWB Hedging Instruments [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	36,000,000		14,000,000
US GMWB Hedging Instruments [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	1,000,000		(1,000,000)
US GMWB Hedging Instruments [Member] | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	44,000,000		60,000,000
US GMWB Hedging Instruments [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000		21,000,000
GMWB Reinsurance [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	60,000,000		73,000,000
GMWB Reinsurance [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	0		0
GMWB Reinsurance [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	0		0
GMWB Reinsurance [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB			73,000,000
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	66,000,000		68,000,000
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	0		0
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	66,000,000		68,000,000
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	0		0
Macro Hedge Program [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	113,000,000		128,000,000
Macro Hedge Program [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	58,000,000		50,000,000
Macro Hedge Program [Member] | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Macro Hedge Program [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Macro Hedge Program [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	9,000,000		8,000,000
Macro Hedge Program [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	3,000,000		3,000,000
Macro Hedge Program [Member] | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	104,000,000		120,000,000
Macro Hedge Program [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	55,000,000		47,000,000
ERROR in label resolution. | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000		17,000,000
ERROR in label resolution. | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(2,000,000)
ERROR in label resolution. | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
ERROR in label resolution. | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0
ERROR in label resolution. | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000		17,000,000
ERROR in label resolution. | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(2,000,000)
ERROR in label resolution. | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
ERROR in label resolution. | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0
ERROR in label resolution. | Fair Value, Measurements, Recurring [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			(13,000,000)
ERROR in label resolution. | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			0
ERROR in label resolution. | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			(13,000,000)
ERROR in label resolution. | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			0
Equity Contract [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	4,000,000
Equity Contract [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	37,000,000
Equity Contract [Member] | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0
Equity Contract [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0
Equity Contract [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0
Equity Contract [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	37,000,000
Equity Contract [Member] | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	4,000,000
Equity Contract [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0
Equity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			33,000,000
Equity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			0
Equity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			33,000,000
Equity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			0
Foreign Exchange Contract [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	3,000,000		27,000,000
Foreign Exchange Contract [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(262,000,000)
Foreign Exchange Contract [Member] | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Foreign Exchange Contract [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0
Foreign Exchange Contract [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	3,000,000		27,000,000
Foreign Exchange Contract [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(262,000,000)
Foreign Exchange Contract [Member] | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Foreign Exchange Contract [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			(237,000,000)
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			(237,000,000)
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			0
Interest Rate Contract [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	48,000,000		(427,000,000)
Interest Rate Contract [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(517,000,000)
Interest Rate Contract [Member] | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Interest Rate Contract [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0
Interest Rate Contract [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	43,000,000		(427,000,000)
Interest Rate Contract [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(488,000,000)
Interest Rate Contract [Member] | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	5,000,000		0
Interest Rate Contract [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(29,000,000)
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			(542,000,000)
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			0
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			(521,000,000)
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			(21,000,000)
Other Contract [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			1,000,000
Other Contract [Member] | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			0
Other Contract [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			0
Other Contract [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	76,000,000		100,000,000
Other Contract [Member] | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net			1,000,000
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	250,000,000		(180,000,000)
Derivative Financial Instruments, Assets [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	93,000,000		(361,000,000)
Derivative Financial Instruments, Assets [Member] | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	157,000,000		181,000,000
Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(683,000,000)		(689,000,000)
Derivative Financial Instruments, Liabilities [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(711,000,000)		(736,000,000)
Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	28,000,000		47,000,000
Guaranteed Minimum Withdrawal Benefit [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure			(241,000,000)
Guaranteed Minimum Withdrawal Benefit [Member] | Other policyholder funds and benefits payable [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(157,000,000)
Guaranteed Minimum Withdrawal Benefit [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure			0
Guaranteed Minimum Withdrawal Benefit [Member] | Level 1 [Member] | Other policyholder funds and benefits payable [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0
Guaranteed Minimum Withdrawal Benefit [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure			0
Guaranteed Minimum Withdrawal Benefit [Member] | Level 2 [Member] | Other policyholder funds and benefits payable [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0
Guaranteed Minimum Withdrawal Benefit [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure			(241,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	157,000,000	$ (361,000,000)	(241,000,000)	$ (262,000,000)
Estimate of Fair Value Measurement [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	887,000,000		1,000,000,000
Portion at Other than Fair Value Measurement [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	$ 3,000,000,000		$ 4,000,000,000
Hedge Funds [Member] | Separate Accounts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage	42.00%		39.00%
Private Equity Funds [Member] | Separate Accounts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage	12.00%		11.00%
Reinsurance Recoverable [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 60,000,000		$ 73,000,000