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Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Measurement [Domain]      
Assets, Fair Value Disclosure [Abstract]      
Alternative Investments, Fair Value Disclosure $ 0 $ 622  
Separate Account Assets 111,634 118,174  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Alternative Investments, Fair Value Disclosure 0 0  
Separate Account Assets 71,606 78,110  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Alternative Investments, Fair Value Disclosure 0 0  
Separate Account Assets 38,856 38,700  
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Alternative Investments, Fair Value Disclosure 0 0  
Separate Account Assets 201 140  
Available-for-sale Securities, Debt Securities 56,003 59,196  
Marketable Securities, Fixed Maturities 293 503  
Trading Securities, Equity 11 11  
Available-for-sale Securities, Equity Securities 1,097 1,121  
Other Short-term Investments 3,244 1,843  
Alternative Investments, Fair Value Disclosure 2,456 2,874  
Reinsurance Recoverables, Including Reinsurance Premium Paid 23,311 23,189  
Separate Account Assets 115,665 120,123  
Assets, Fair Value Disclosure 172,243 181,633  
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 299 288 $ 168
Liabilities, Fair Value Disclosure [Abstract]      
Financial and Nonfinancial Liabilities, Fair Value Disclosure (988) (1,086)  
Derivative Liability, Fair Value, Amount Offset Against Collateral 56 23  
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 620 740  
Assets, Fair Value Disclosure [Abstract]      
Marketable Securities, Fixed Maturities 1 2  
Trading Securities, Equity 11 11  
Available-for-sale Securities, Equity Securities 821 874  
Other Short-term Investments 878 333  
Assets, Fair Value Disclosure 73,937 80,070  
Liabilities, Fair Value Disclosure [Abstract]      
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0  
Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 51,573 55,143  
Assets, Fair Value Disclosure [Abstract]      
Marketable Securities, Fixed Maturities 281 485  
Trading Securities, Equity 0 0  
Available-for-sale Securities, Equity Securities 177 154  
Other Short-term Investments 2,366 1,510  
Assets, Fair Value Disclosure 92,960 95,907  
Liabilities, Fair Value Disclosure [Abstract]      
Financial and Nonfinancial Liabilities, Fair Value Disclosure (736) (900)  
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 3,810 3,313  
Assets, Fair Value Disclosure [Abstract]      
Marketable Securities, Fixed Maturities 11 16  
Trading Securities, Equity 0 0  
Available-for-sale Securities, Equity Securities 99 93  
Other Short-term Investments 0 0  
Assets, Fair Value Disclosure 4,375 3,810  
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 274 (288)  
Liabilities, Fair Value Disclosure [Abstract]      
Financial and Nonfinancial Liabilities, Fair Value Disclosure (252) (186)  
Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 2,382 2,499  
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 2,300 2,462  
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 82 37  
Collateralized Debt Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 1,916 3,038  
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 1,502 2,497  
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 414 541  
Commercial Mortgage Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 4,936 4,717  
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 4,856 4,567  
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 80 150  
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 52 122  
Corporate Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 25,666 26,802  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 24,586 25,948  
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 1,080 854  
Foreign Government Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 1,171 1,308  
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 1,107 1,248  
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 64 60  
US States and Political Subdivisions Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 11,486 12,121  
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 11,368 12,072  
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 118 49  
Residential Mortgage Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 4,767 4,046  
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 2,795 2,424  
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 1,972 1,622  
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 1,963 1,622  
US Treasury Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 3,679 4,665  
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 620 740  
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 3,059 3,925  
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   288 165
US GMWB Hedging Instruments [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 74 111  
US GMWB Hedging Instruments [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
US GMWB Hedging Instruments [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 14 27  
US GMWB Hedging Instruments [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 60 84  
US GMWB Hedging Instruments [Member] | Other Liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 20 47  
US GMWB Hedging Instruments [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
US GMWB Hedging Instruments [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (1) (4)  
US GMWB Hedging Instruments [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 21 51  
Macro Hedge Program [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 128 74  
Macro Hedge Program [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Macro Hedge Program [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 8 0  
Macro Hedge Program [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 120 74  
Macro Hedge Program [Member] | Other Liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 50 73  
Macro Hedge Program [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Macro Hedge Program [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 3 0  
Macro Hedge Program [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 47 73  
GMWB Reinsurance [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 73 83  
GMWB Reinsurance [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 0 0  
GMWB Reinsurance [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 0 0  
GMWB Reinsurance [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid   83  
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 68 79  
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 0 0  
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 68 79  
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 0 0  
Credit Risk Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 17 21  
Credit Risk Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Credit Risk Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 17 21  
Credit Risk Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Credit Risk Contract [Member] | Other Liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (13)    
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (13)    
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (16)  
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (16)  
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Equity Contract [Member] | Other Liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 33    
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 33    
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   41  
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   41  
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [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 27 15  
Foreign Exchange Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Foreign Exchange Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 27 15  
Foreign Exchange Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Foreign Exchange Contract [Member] | Other Liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (237)    
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (237)    
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (374)  
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (374)  
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [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 (427) (227)  
Interest Rate Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Interest Rate Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (427) (227)  
Interest Rate Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Interest Rate Contract [Member] | Other Liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (542)    
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (521)    
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (21)    
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (569)  
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (547)  
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (22)  
Other Contract [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 100 131  
Other Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 1 7  
Other Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Other Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Other Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 1 7  
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (180) 1  
Derivative Financial Instruments, Assets [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (361) (164)  
Derivative Financial Instruments, Assets [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 181 165  
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (689) (798)  
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (736) (900)  
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 47 102  
Embedded Derivative Financial Instruments [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   0 3
Portion at Other than Fair Value Measurement [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
HIG_FairValueAssetLevel1toLevel2Transfers 1,700 1,900  
Assets, Fair Value Disclosure [Abstract]      
Separate Account Assets 4,000 1,800  
Guaranteed Minimum Withdrawal Benefit [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure (241) (262)  
Guaranteed Minimum Withdrawal Benefit [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure 0 0  
Guaranteed Minimum Withdrawal Benefit [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure 0 0  
Guaranteed Minimum Withdrawal Benefit [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure   (262)  
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   262  
Guaranteed Minimum Withdrawal Benefit [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 241 262 139
Liability [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure (274) (288)  
Liability [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure 0 0  
Liability [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure 0 0  
Liability [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure (274) (288)  
Equity Linked Notes [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure (33) (26)  
Equity Linked Notes [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure 0 0  
Equity Linked Notes [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure 0 0  
Equity Linked Notes [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure   (26)  
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 33 26  
Equity Linked Notes [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   26 $ 26
Obligations [Member]      
Assets, Fair Value Disclosure [Abstract]      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (25) $ 0  
Obligations [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure (25)    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ (25)    
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% 30.00%  
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 11.00% 2.00%