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Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jul. 01, 2017	Jun. 30, 2017	Dec. 31, 2016	Jul. 01, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value Measurement [Domain]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	$ 113,197,000,000		$ 113,197,000,000				$ 111,634,000,000
Fair Value Measurement [Domain] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	74,053,000,000		74,053,000,000				71,606,000,000
Fair Value Measurement [Domain] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	38,019,000,000		38,019,000,000				38,856,000,000
Fair Value Measurement [Domain] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Separate Account Assets	226,000,000		226,000,000				201,000,000
Available-for-sale Securities, Debt Securities	57,669,000,000		57,669,000,000				56,003,000,000
Fixed maturities, at fair value using the fair value option	82,000,000		82,000,000				293,000,000
Trading Securities, Equity	11,000,000		11,000,000				11,000,000
Equity securities, available-for-sale, at fair value (cost of $1,010 and $1,020)	1,112,000,000		1,112,000,000				1,097,000,000
Short-term investments	3,756,000,000		3,756,000,000				3,244,000,000
Reinsurance recoverable for U.S. GMWB	23,323,000,000		23,323,000,000				23,311,000,000
Separate Account Assets	115,626,000,000		115,626,000,000				115,665,000,000
Alternative Investments, Fair Value Disclosure	2,533,000,000		2,533,000,000				2,456,000,000
Assets, Fair Value Disclosure	176,138,000,000		176,138,000,000				172,243,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	(837,000,000)		(837,000,000)				(988,000,000)
Derivative Liability, Fair Value, Amount Offset Against Collateral	13,000,000		13,000,000				56,000,000
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0	$ 0	0	$ 0	$ 0			$ 0
Business Combination, Contingent Consideration, Liability	60		60
ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,305,000,000		2,305,000,000				2,382,000,000
Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,395,000,000		2,395,000,000				1,916,000,000
CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	5,120,000,000		5,120,000,000				4,936,000,000
Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	25,746,000,000		25,746,000,000				25,666,000,000
Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,365,000,000		1,365,000,000				1,171,000,000
Municipal [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	12,435,000,000		12,435,000,000				11,486,000,000
RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	4,205,000,000		4,205,000,000				4,767,000,000
U.S. Treasuries [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	4,098,000,000		4,098,000,000				3,679,000,000
Liabilities, Fair Value Disclosure [Abstract]
HIG_FairValueAssetsLevel1ToLevel2TransfersAmount	463,000,000	508,000,000	1,800,000,000	1,300,000,000
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	338,000,000		338,000,000				620,000,000
Fixed maturities, at fair value using the fair value option	0		0				1,000,000
Trading Securities, Equity	11,000,000		11,000,000				11,000,000
Equity securities, available-for-sale, at fair value (cost of $1,010 and $1,020)	840,000,000		840,000,000				821,000,000
Short-term investments	1,922,000,000		1,922,000,000				878,000,000
Assets, Fair Value Disclosure	77,164,000,000		77,164,000,000				73,937,000,000
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	338,000,000		338,000,000				620,000,000
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	53,886,000,000		53,886,000,000				51,573,000,000
Fixed maturities, at fair value using the fair value option	82,000,000		82,000,000				281,000,000
Trading Securities, Equity	0		0				0
Equity securities, available-for-sale, at fair value (cost of $1,010 and $1,020)	155,000,000		155,000,000				177,000,000
Short-term investments	1,834,000,000		1,834,000,000				2,366,000,000
Assets, Fair Value Disclosure	94,038,000,000		94,038,000,000				92,960,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	(700,000,000)		(700,000,000)				(736,000,000)
Level 2 [Member] | ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,249,000,000		2,249,000,000				2,300,000,000
Level 2 [Member] | Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,207,000,000		2,207,000,000				1,502,000,000
Level 2 [Member] | CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	5,027,000,000		5,027,000,000				4,856,000,000
Level 2 [Member] | Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	24,707,000,000		24,707,000,000				24,586,000,000
Level 2 [Member] | Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,332,000,000		1,332,000,000				1,107,000,000
Level 2 [Member] | Municipal [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	12,349,000,000		12,349,000,000				11,368,000,000
Level 2 [Member] | RMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	2,255,000,000		2,255,000,000				2,795,000,000
Level 2 [Member] | U.S. Treasuries [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	3,760,000,000		3,760,000,000				3,059,000,000
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	3,445,000,000		3,445,000,000				3,810,000,000
Fixed maturities, at fair value using the fair value option	0		0				11,000,000
Trading Securities, Equity	0		0				0
Equity securities, available-for-sale, at fair value (cost of $1,010 and $1,020)	117,000,000		117,000,000				99,000,000
Short-term investments	0		0				0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	121,000,000	356,000,000	121,000,000	356,000,000		$ 198,000,000	299,000,000		$ 440,000,000	$ 288,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	57,000,000	101,000,000	190,000,000	(18,000,000)
Assets, Fair Value Disclosure	4,037,000,000		4,037,000,000				4,375,000,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities accounted for at fair value on a recurring basis	(137,000,000)		(137,000,000)				(252,000,000)
Level 3 [Member] | Other policyholder funds and benefits payable [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	58,000,000	78,000,000	193,000,000	(41,000,000)
Level 3 [Member] | ABS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	56,000,000		56,000,000				82,000,000
Level 3 [Member] | Collateralized Debt Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	188,000,000		188,000,000				414,000,000
Level 3 [Member] | CMBS [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	93,000,000		93,000,000				80,000,000
Level 3 [Member] | Corporate [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	1,039,000,000		1,039,000,000				1,080,000,000
Level 3 [Member] | Foreign Government Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities, Debt Securities	33,000,000		33,000,000				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	1,950,000,000		1,950,000,000				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							(274,000,000)
Liability [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure							0
Liability [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure							0
Liability [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure							(274,000,000)
Obligations [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(28,000,000)		(28,000,000)				(25,000,000)
Obligations [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure	(28,000,000)		(28,000,000)				(25,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	28,000,000	(23,000,000)	28,000,000	(23,000,000)		27,000,000	25,000,000		0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	23,000,000			23,000,000
Equity Linked Notes [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure							(33,000,000)
Equity Linked Notes [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure							0
Equity Linked Notes [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Obligations, Fair Value Disclosure							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	0	31,000,000	0	31,000,000		37,000,000	33,000,000		28,000,000	26,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0	(3,000,000)	(4,000,000)	(5,000,000)
US GMWB Hedging Instruments [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	39,000,000		39,000,000				74,000,000
US GMWB Hedging Instruments [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	26,000,000		26,000,000				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	(1,000,000)		(1,000,000)				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	42,000,000		42,000,000				(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	40,000,000		40,000,000				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	(16,000,000)		(16,000,000)				21,000,000
GMWB Reinsurance [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	51,000,000		51,000,000				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	51,000,000		51,000,000				73,000,000
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]
Assets, Fair Value Disclosure [Abstract]
Reinsurance recoverable for U.S. GMWB	57,000,000		57,000,000				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	57,000,000		57,000,000				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	158,000,000		158,000,000				128,000,000
Macro Hedge Program [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	8,000,000		8,000,000				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	0		0				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	(17,000,000)		(17,000,000)				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	158,000,000		158,000,000				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	25,000,000		25,000,000				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	(3,000,000)		(3,000,000)				(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	(3,000,000)		(3,000,000)				(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 liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000		2,000,000				33,000,000
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 liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net							33,000,000
Equity Contract [Member] | Level 3 [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	2,000,000		2,000,000				0
Foreign Exchange Contract [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(4,000,000)		(4,000,000)				27,000,000
Foreign Exchange Contract [Member] | Other liabilities [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(270,000,000)		(270,000,000)				(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		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		0				0
Foreign Exchange Contract [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	(4,000,000)		(4,000,000)				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	(270,000,000)		(270,000,000)				(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		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		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	(479,000,000)		(479,000,000)				(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	(452,000,000)		(452,000,000)				(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	(27,000,000)		(27,000,000)				(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	62,000,000		62,000,000				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	203,000,000		203,000,000				(180,000,000)
Derivative Financial Instruments, Assets [Member] | Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	0		0
Derivative Financial Instruments, Assets [Member] | Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets (Liabilities), at Fair Value, Net	5,000,000		5,000,000				(361,000,000)
Derivative Financial Instruments, Assets [Member] | Level 3 [Member] | Other Investments [Member]
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