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Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value Measurement [Domain]                
Assets, Fair Value Disclosure [Abstract]                
Alternative Investments, Fair Value Disclosure $ 0   $ 0     $ 622,000,000    
Separate Account Assets 116,163,000,000   116,163,000,000     118,174,000,000    
Fair Value Measurement [Domain] | Level 1 [Member]                
Assets, Fair Value Disclosure [Abstract]                
Alternative Investments, Fair Value Disclosure 0   0     0    
Separate Account Assets 74,870,000,000   74,870,000,000     78,110,000,000    
Fair Value Measurement [Domain] | Level 2 [Member]                
Assets, Fair Value Disclosure [Abstract]                
Alternative Investments, Fair Value Disclosure 0   0     0    
Separate Account Assets 40,028,000,000   40,028,000,000     38,700,000,000    
Fair Value Measurement [Domain] | Level 3 [Member]                
Assets, Fair Value Disclosure [Abstract]                
Alternative Investments, Fair Value Disclosure 0   0     0    
Separate Account Assets 325,000,000   325,000,000     140,000,000    
Available-for-sale Securities, Debt Securities 60,225,000,000   60,225,000,000     59,196,000,000    
Trading Securities, Equity 11,000,000   11,000,000     11,000,000    
Available-for-sale Securities, Equity Securities 875,000,000   875,000,000     1,121,000,000    
Short-term investments 2,219,000,000   2,219,000,000     1,843,000,000    
Alternative Investments, Fair Value Disclosure 2,482,000,000   2,482,000,000     2,874,000,000    
Reinsurance recoverable for U.S. GMWB 23,126,000,000   23,126,000,000     23,189,000,000    
Separate Account Assets 118,648,000,000   118,648,000,000     120,123,000,000    
Assets, Fair Value Disclosure 180,260,000,000   180,260,000,000     181,633,000,000    
Marketable Securities, Fixed Maturities 360,000,000   360,000,000     503,000,000    
Liabilities, Fair Value Disclosure [Abstract]                
Total liabilities accounted for at fair value on a recurring basis (1,411,000,000)   (1,411,000,000)     (1,086,000,000)    
Derivative Liability, Fair Value, Amount Offset Against Collateral 44,000,000   44,000,000     23,000,000    
HIG_FairValueAssetsLevel2ToLevel1TransfersAmounts 0 $ 0 0 $ 0        
Credit derivative [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 8,000,000   8,000,000     21,000,000    
Credit derivative [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net (10,000,000)   (10,000,000)          
Equity Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 30,000,000   30,000,000          
Foreign Exchange Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 2,000,000   2,000,000     15,000,000    
Foreign Exchange Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net (257,000,000)   (257,000,000)          
Interest Rate Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 104,000,000   104,000,000     (227,000,000)    
Interest Rate Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net (961,000,000)   (961,000,000)          
Other Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 2,000,000   2,000,000     7,000,000    
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 278,000,000   278,000,000     1,000,000    
Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net (1,055,000,000)   (1,055,000,000)     (798,000,000)    
ABS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 2,685,000,000   2,685,000,000     2,499,000,000    
Collateralized Debt Obligations [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 2,573,000,000   2,573,000,000     3,038,000,000    
CMBS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 5,268,000,000   5,268,000,000     4,717,000,000    
Corporate [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 26,904,000,000   26,904,000,000     26,802,000,000    
Foreign Government Debt Securities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 1,186,000,000   1,186,000,000     1,308,000,000    
Municipal [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 12,594,000,000   12,594,000,000     12,121,000,000    
RMBS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 4,936,000,000   4,936,000,000     4,046,000,000    
U.S. Treasuries [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 4,079,000,000   4,079,000,000     4,665,000,000    
Liabilities, Fair Value Disclosure [Abstract]                
HIG_FairValueAssetsLevel1ToLevel2TransfersAmount 508,000,000 471 1,316,000,000 995        
Level 1 [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 348,000,000   348,000,000     740,000,000    
Trading Securities, Equity 11,000,000   11,000,000     11,000,000    
Available-for-sale Securities, Equity Securities 645,000,000   645,000,000     874,000,000    
Short-term investments 494,000,000   494,000,000     333,000,000    
Assets, Fair Value Disclosure 76,368,000,000   76,368,000,000     80,070,000,000    
Marketable Securities, Fixed Maturities 0   0     2,000,000    
Liabilities, Fair Value Disclosure [Abstract]                
Total liabilities accounted for at fair value on a recurring basis 0   0     0    
Level 1 [Member] | Credit derivative [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0     0    
Level 1 [Member] | Credit derivative [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Level 1 [Member] | Equity Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Level 1 [Member] | Foreign Exchange Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0     0    
Level 1 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Level 1 [Member] | Interest Rate Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0     0    
Level 1 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Level 1 [Member] | Other Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0     0    
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 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 348,000,000   348,000,000     740,000,000    
Level 2 [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 55,951,000,000   55,951,000,000     55,143,000,000    
Trading Securities, Equity 0   0     0    
Available-for-sale Securities, Equity Securities 130,000,000   130,000,000     154,000,000    
Short-term investments 1,725,000,000   1,725,000,000     1,510,000,000    
Assets, Fair Value Disclosure 98,315,000,000   98,315,000,000     95,907,000,000    
Marketable Securities, Fixed Maturities 351,000,000   351,000,000     485,000,000    
Liabilities, Fair Value Disclosure [Abstract]                
Total liabilities accounted for at fair value on a recurring basis (1,145,000,000)   (1,145,000,000)     (900,000,000)    
Level 2 [Member] | Credit derivative [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 8,000,000   8,000,000     21,000,000    
Level 2 [Member] | Credit derivative [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net (10,000,000)   (10,000,000)          
Level 2 [Member] | Equity Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 30,000,000   30,000,000          
Level 2 [Member] | Foreign Exchange Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 2,000,000   2,000,000     15,000,000    
Level 2 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net (257,000,000)   (257,000,000)          
Level 2 [Member] | Interest Rate Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 104,000,000   104,000,000     (227,000,000)    
Level 2 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net (929,000,000)   (929,000,000)          
Level 2 [Member] | Other Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0     0    
Level 2 [Member] | Derivative Financial Instruments, Assets [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 99,000,000   99,000,000     (164,000,000)    
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net (1,145,000,000)   (1,145,000,000)     (900,000,000)    
Level 2 [Member] | ABS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 2,654,000,000   2,654,000,000     2,462,000,000    
Level 2 [Member] | Collateralized Debt Obligations [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 2,104,000,000   2,104,000,000     2,497,000,000    
Level 2 [Member] | CMBS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 5,191,000,000   5,191,000,000     4,567,000,000    
Level 2 [Member] | Corporate [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 25,810,000,000   25,810,000,000     25,948,000,000    
Level 2 [Member] | Foreign Government Debt Securities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 1,112,000,000   1,112,000,000     1,248,000,000    
Level 2 [Member] | Municipal [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 12,468,000,000   12,468,000,000     12,072,000,000    
Level 2 [Member] | RMBS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 2,881,000,000   2,881,000,000     2,424,000,000    
Level 2 [Member] | U.S. Treasuries [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 3,731,000,000   3,731,000,000     3,925,000,000    
Level 3 [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 3,926,000,000   3,926,000,000     3,313,000,000    
Trading Securities, Equity 0   0     0    
Available-for-sale Securities, Equity Securities 100,000,000   100,000,000     93,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 379,000,000   379,000,000   $ (440,000,000) (288,000,000)    
Short-term investments 0   0     0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 325,000,000 164,000,000 325,000,000 164,000,000 171,000,000 139,000,000 $ 285,000,000 $ 112,000,000
Assets, Fair Value Disclosure 4,637,000,000   4,637,000,000     3,810,000,000    
Marketable Securities, Fixed Maturities 9,000,000   9,000,000     16,000,000    
Liabilities, Fair Value Disclosure [Abstract]                
Total liabilities accounted for at fair value on a recurring basis (266,000,000)   (266,000,000)     (186,000,000)    
Level 3 [Member] | Credit derivative [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0     0    
Level 3 [Member] | Credit derivative [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Level 3 [Member] | Equity Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Level 3 [Member] | Foreign Exchange Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0     0    
Level 3 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Level 3 [Member] | Interest Rate Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 0   0     0    
Level 3 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net (32,000,000)   (32,000,000)          
Level 3 [Member] | Other Contract [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 2,000,000   2,000,000     7,000,000    
Level 3 [Member] | Derivative Financial Instruments, Assets [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 179,000,000   179,000,000     165,000,000    
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 90,000,000   90,000,000     102,000,000    
Level 3 [Member] | ABS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 31,000,000   31,000,000     37,000,000    
Level 3 [Member] | Collateralized Debt Obligations [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 469,000,000   469,000,000     541,000,000    
Level 3 [Member] | CMBS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 77,000,000   77,000,000     150,000,000    
Level 3 [Member] | Corporate [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 1,094,000,000   1,094,000,000     854,000,000    
Level 3 [Member] | Foreign Government Debt Securities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 74,000,000   74,000,000     60,000,000    
Level 3 [Member] | Municipal [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 126,000,000   126,000,000     49,000,000    
Level 3 [Member] | RMBS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 2,055,000,000   2,055,000,000     1,622,000,000    
Level 3 [Member] | U.S. Treasuries [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 0   0     0    
Fair Value, Measurements, Recurring [Member] | Credit derivative [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           (16,000,000)    
Fair Value, Measurements, Recurring [Member] | Equity Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           41,000,000    
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           (374,000,000)    
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           (569,000,000)    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Credit derivative [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Credit derivative [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           (16,000,000)    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           41,000,000    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           (374,000,000)    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           (547,000,000)    
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   (291,000,000)   (291,000,000)     (138,000,000) (165,000,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Credit derivative [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net           (22,000,000)    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Embedded Derivative Financial Instruments [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   0   0     (3,000,000) (3,000,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | CMBS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 53,000,000   53,000,000     122,000,000    
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | RMBS [Member]                
Assets, Fair Value Disclosure [Abstract]                
Available-for-sale Securities, Debt Securities 2,055,000,000   2,055,000,000     1,622,000,000    
Liability [Member]                
Assets, Fair Value Disclosure [Abstract]                
Obligations, Fair Value Disclosure 379,000,000   379,000,000     288,000,000    
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 379,000,000   379,000,000     288,000,000    
Obligations [Member] | Level 3 [Member]                
Assets, Fair Value Disclosure [Abstract]                
Obligations, Fair Value Disclosure 23,000,000   23,000,000          
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 23,000,000   23,000,000   0 0    
Equity Linked Notes [Member]                
Assets, Fair Value Disclosure [Abstract]                
Obligations, Fair Value Disclosure 31,000,000   31,000,000     26,000,000    
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           26,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 31,000,000   31,000,000   (28,000,000) (26,000,000)    
Equity Linked Notes [Member] | 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   (21,000,000)   (21,000,000)     (26,000,000) (26,000,000)
US GMWB Hedging Instruments [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 66,000,000   66,000,000     111,000,000    
US GMWB Hedging Instruments [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 103,000,000   103,000,000     47,000,000    
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 (15,000,000)   (15,000,000)     27,000,000    
US GMWB Hedging Instruments [Member] | Level 2 [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 53,000,000   53,000,000     (4,000,000)    
US GMWB Hedging Instruments [Member] | Level 3 [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 81,000,000   81,000,000     84,000,000    
US GMWB Hedging Instruments [Member] | Level 3 [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 50,000,000   50,000,000     51,000,000    
US GMWB Hedging Instruments [Member] | Level 3 [Member] | Other Contract [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 142,000,000   142,000,000     131,000,000    
GMWB Reinsurance [Member]                
Assets, Fair Value Disclosure [Abstract]                
Reinsurance recoverable for U.S. GMWB 98,000,000   98,000,000     83,000,000    
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           83,000,000    
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]                
Assets, Fair Value Disclosure [Abstract]                
Reinsurance recoverable for U.S. GMWB 31,000,000   31,000,000     79,000,000    
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 31,000,000   31,000,000     79,000,000    
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 96,000,000   96,000,000     74,000,000    
Macro Hedge Program [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 40,000,000   40,000,000     73,000,000    
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     0    
Macro Hedge Program [Member] | Level 2 [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net (32,000,000)   (32,000,000)     0    
Macro Hedge Program [Member] | Level 3 [Member] | Other Investments [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 96,000,000   96,000,000     74,000,000    
Macro Hedge Program [Member] | Level 3 [Member] | Other liabilities [Member]                
Assets, Fair Value Disclosure [Abstract]                
Derivative Assets (Liabilities), at Fair Value, Net 72,000,000   72,000,000     73,000,000    
Guaranteed Minimum Withdrawal Benefit [Member]                
Assets, Fair Value Disclosure [Abstract]                
Obligations, Fair Value Disclosure 348,000,000   348,000,000     262,000,000    
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           262,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 348,000,000   348,000,000   $ (412,000,000) (262,000,000)    
Guaranteed Minimum Withdrawal Benefit [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   $ (270,000,000)   $ (270,000,000)     $ (112,000,000) $ (139,000,000)
Estimate of Fair Value Measurement [Member]                
Assets, Fair Value Disclosure [Abstract]                
Separate Account Assets 900,000,000   900,000,000     1,200,000,000    
Portion at Other than Fair Value Measurement [Member]                
Assets, Fair Value Disclosure [Abstract]                
Separate Account Assets $ 2,500,000,000   $ 2,500,000,000     $ 1,800,000,000    
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 39.00%   39.00%     28.00%    
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 19.00%   19.00%     4.00%    
Reinsurance Recoverable [Member] | Level 3 [Member]                
Assets, Fair Value Disclosure [Abstract]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 98,000,000   $ 98,000,000     $ 83,000,000