Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Fair Value Measurement [Domain]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	$ 112,559,000,000		$ 112,559,000,000			$ 111,634,000,000
Fair Value Measurement [Domain] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	73,019,000,000		73,019,000,000			71,606,000,000
Fair Value Measurement [Domain] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	38,466,000,000		38,466,000,000			38,856,000,000
Fair Value Measurement [Domain] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	192,000,000		192,000,000			201,000,000
Available-for-sale Securities, Debt Securities	57,834,000,000		57,834,000,000			56,003,000,000
Trading Securities, Equity	11,000,000		11,000,000			11,000,000
Available-for-sale Securities, Equity Securities	1,055,000,000		1,055,000,000			1,097,000,000
Short-term investments	4,716,000,000		4,716,000,000			3,244,000,000
Alternative Investments, Fair Value Disclosure	2,445,000,000		2,445,000,000			2,456,000,000
Reinsurance recoverable for U.S. GMWB	23,265,000,000		23,265,000,000			23,311,000,000
Separate Account Assets	116,746,000,000		116,746,000,000			115,665,000,000
Assets, Fair Value Disclosure	176,587,000,000		176,587,000,000			172,243,000,000
Marketable Securities, Fixed Maturities	146,000,000		146,000,000			293,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	(807,000,000)		(807,000,000)			(988,000,000)
Derivative Liability, Fair Value, Amount Offset Against Collateral	12,000,000		12,000,000			56,000,000
HIG_FairValueAssetsLevel2ToLevel1TransfersAmounts	0	$ 0	0	$ 0
Business Combination, Contingent Consideration, Liability	60		60
ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,354,000,000		2,354,000,000			2,382,000,000
Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,457,000,000		2,457,000,000			1,916,000,000
CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	5,173,000,000		5,173,000,000			4,936,000,000
Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	26,044,000,000		26,044,000,000			25,666,000,000
Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,297,000,000		1,297,000,000			1,171,000,000
Municipal [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	12,284,000,000		12,284,000,000			11,486,000,000
RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	4,219,000,000		4,219,000,000			4,767,000,000
U.S. Treasuries [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	4,006,000,000		4,006,000,000			3,679,000,000
Liabilities, Fair Value Disclosure [Abstract]
HIG_FairValueAssetsLevel1ToLevel2TransfersAmount	692,000,000	67,000,000	1,300,000,000	808,000,000
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	463,000,000		463,000,000			620,000,000
Trading Securities, Equity	11,000,000		11,000,000			11,000,000
Available-for-sale Securities, Equity Securities	789,000,000		789,000,000			821,000,000
Short-term investments	1,916,000,000		1,916,000,000			878,000,000
Assets, Fair Value Disclosure	76,198,000,000		76,198,000,000			73,937,000,000
Marketable Securities, Fixed Maturities	0		0			1,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	0		0			0
Level 1 [Member] | ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0			0
Level 1 [Member] | Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0			0
Level 1 [Member] | CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0			0
Level 1 [Member] | Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0			0
Level 1 [Member] | Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0			0
Level 1 [Member] | Municipal [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0			0
Level 1 [Member] | RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0			0
Level 1 [Member] | U.S. Treasuries [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	463,000,000		463,000,000			620,000,000
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	53,576,000,000		53,576,000,000			51,573,000,000
Trading Securities, Equity	0		0			0
Available-for-sale Securities, Equity Securities	168,000,000		168,000,000			177,000,000
Short-term investments	2,800,000,000		2,800,000,000			2,366,000,000
Assets, Fair Value Disclosure	95,233,000,000		95,233,000,000			92,960,000,000
Marketable Securities, Fixed Maturities	146,000,000		146,000,000			281,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	(653,000,000)		(653,000,000)			(736,000,000)
Level 2 [Member] | ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,258,000,000		2,258,000,000			2,300,000,000
Level 2 [Member] | Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,118,000,000		2,118,000,000			1,502,000,000
Level 2 [Member] | CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	5,075,000,000		5,075,000,000			4,856,000,000
Level 2 [Member] | Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	24,908,000,000		24,908,000,000			24,586,000,000
Level 2 [Member] | Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,268,000,000		1,268,000,000			1,107,000,000
Level 2 [Member] | Municipal [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	12,198,000,000		12,198,000,000			11,368,000,000
Level 2 [Member] | RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,208,000,000		2,208,000,000			2,795,000,000
Level 2 [Member] | U.S. Treasuries [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	3,543,000,000		3,543,000,000			3,059,000,000
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	3,795,000,000		3,795,000,000			3,810,000,000
Trading Securities, Equity	0		0			0
Available-for-sale Securities, Equity Securities	98,000,000		98,000,000			99,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(198,000,000)	(440,000,000)	(198,000,000)	(440,000,000)	$ (219,000,000)	(299,000,000)	$ (386,000,000)	$ (288,000,000)
Short-term investments	0		0			0
Assets, Fair Value Disclosure	4,274,000,000		4,274,000,000			4,375,000,000
Marketable Securities, Fixed Maturities	0		0			11,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	(154,000,000)		(154,000,000)			(252,000,000)
Level 3 [Member] | ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	96,000,000		96,000,000			82,000,000
Level 3 [Member] | Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	339,000,000		339,000,000			414,000,000
Level 3 [Member] | CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	98,000,000		98,000,000			80,000,000
Level 3 [Member] | Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,136,000,000		1,136,000,000			1,080,000,000
Level 3 [Member] | Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	29,000,000		29,000,000			64,000,000
Level 3 [Member] | Municipal [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	86,000,000		86,000,000			118,000,000
Level 3 [Member] | RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,011,000,000		2,011,000,000			1,972,000,000
Level 3 [Member] | U.S. Treasuries [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	0		0			0
Liability [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(171,000,000)		(171,000,000)			(274,000,000)
Liability [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0		0			0
Liability [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0		0			0
Liability [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(171,000,000)		(171,000,000)			(274,000,000)
Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(27,000,000)		(27,000,000)			(25,000,000)
Obligations [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(27,000,000)		(27,000,000)			(25,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(27,000,000)		(27,000,000)		(26,000,000)	(25,000,000)
Equity Linked Notes [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(37,000,000)		(37,000,000)			(33,000,000)
Equity Linked Notes [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0		0			0
Equity Linked Notes [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0		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	(37,000,000)	(28,000,000)	(37,000,000)	(28,000,000)	(36,000,000)	(33,000,000)	(25,000,000)	(26,000,000)
US GMWB Hedging Instruments [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	45,000,000		45,000,000			74,000,000
US GMWB Hedging Instruments [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	40,000,000		40,000,000			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			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			0
US GMWB Hedging Instruments [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			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	45,000,000		45,000,000			(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	45,000,000		45,000,000			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	(5,000,000)		(5,000,000)			21,000,000
GMWB Reinsurance [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	57,000,000		57,000,000			73,000,000
GMWB Reinsurance [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	0		0			0
GMWB Reinsurance [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	0		0			0
GMWB Reinsurance [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	57,000,000		57,000,000			73,000,000
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	58,000,000		58,000,000			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			0
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	58,000,000		58,000,000			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			0
Macro Hedge Program [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	94,000,000		94,000,000			128,000,000
Macro Hedge Program [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	74,000,000		74,000,000			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			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			0
Macro Hedge Program [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	8,000,000		8,000,000			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	0		0			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	86,000,000		86,000,000			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	74,000,000		74,000,000			47,000,000
ERROR in label resolution. | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	8,000,000		8,000,000			17,000,000
ERROR in label resolution. | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(6,000,000)		(6,000,000)			(13,000,000)
ERROR in label resolution. | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			0
ERROR in label resolution. | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			0
ERROR in label resolution. | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	8,000,000		8,000,000			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	(6,000,000)		(6,000,000)			(13,000,000)
ERROR in label resolution. | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			0
ERROR in label resolution. | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			0
Equity Contract [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000		2,000,000
Equity Contract [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	38,000,000		38,000,000			33,000,000
Equity Contract [Member] | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Equity Contract [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			0
Equity Contract [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	1,000,000		1,000,000
Equity Contract [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	37,000,000		37,000,000			33,000,000
Equity Contract [Member] | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	1,000,000		1,000,000
Equity Contract [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	1,000,000		1,000,000			0
Foreign Exchange Contract [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net						27,000,000
Foreign Exchange Contract [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(267,000,000)		(267,000,000)			(237,000,000)
Foreign Exchange Contract [Member] | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net						0
Foreign Exchange Contract [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			0
Foreign Exchange Contract [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net						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	(267,000,000)		(267,000,000)			(237,000,000)
Foreign Exchange Contract [Member] | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net						0
Foreign Exchange Contract [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			0
Interest Rate Contract [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000		2,000,000			(427,000,000)
Interest Rate Contract [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(488,000,000)		(488,000,000)			(542,000,000)
Interest Rate Contract [Member] | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			0
Interest Rate Contract [Member] | Level 1 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			0
Interest Rate Contract [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000		2,000,000			(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	(462,000,000)		(462,000,000)			(521,000,000)
Interest Rate Contract [Member] | Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0			0
Interest Rate Contract [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(26,000,000)		(26,000,000)			(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	73,000,000		73,000,000			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	151,000,000		151,000,000			(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	19,000,000		19,000,000			(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	132,000,000		132,000,000			181,000,000
Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(609,000,000)		(609,000,000)			(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			0
Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(653,000,000)		(653,000,000)			(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	44,000,000		44,000,000			47,000,000
Guaranteed Minimum Withdrawal Benefit [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(134,000,000)		(134,000,000)			(241,000,000)
Guaranteed Minimum Withdrawal Benefit [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0		0			0
Guaranteed Minimum Withdrawal Benefit [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	0		0			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	(134,000,000)	$ (412,000,000)	(134,000,000)	$ (412,000,000)	$ (157,000,000)	(241,000,000)	$ (361,000,000)	$ (262,000,000)
Portion at Other than Fair Value Measurement [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	4,200,000,000		4,200,000,000			4,000,000,000
Estimate of Fair Value Measurement [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	$ 882,000,000		$ 882,000,000			$ 1,000,000,000
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	43.00%		43.00%			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	13.00%		13.00%			11.00%