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Fair Value Measurements - Level 4 Fair Value by Hierarchy (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Jun. 01, 2018
Fair Value Measurement [Domain]      
Assets, Fair Value Disclosure [Abstract]      
Separate Account Assets $ 100,323 $ 94,724  
Debt Securities, Available-for-sale 13,977 13,839  
Fair Value, Option, Fixed Maturity Securities 11 12  
Equity Securities, FV-NI 173    
Available-for-sale Securities, Equity Securities   116  
Derivative Asset   212  
Other Short-term Investments 1,204 844  
Reinsurance Recoverables, Including Reinsurance Premium Paid 29,321 29,564 $ 22,615
Separate Account Assets 104,809 98,814 $ 110,773
Assets, Fair Value Disclosure 115,831 109,799  
Liabilities, Fair Value Disclosure [Abstract]      
Financial and Nonfinancial Liabilities, Fair Value Disclosure 269 164  
Portion at Other than Fair Value Measurement [Member]      
Assets, Fair Value Disclosure [Abstract]      
Separate Account Assets 4,000 3,600  
Estimate of Fair Value Measurement [Member]      
Assets, Fair Value Disclosure [Abstract]      
Separate Account Assets 467 468  
Liability [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure (29) (80)  
Guaranteed Minimum Withdrawal Benefit [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure (29) (80)  
Credit Risk Contract [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 1    
Foreign Exchange Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 1    
Derivative Liability 97 91  
Interest Rate Contract [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 39 36  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability 143 137  
US GMWB Hedging Instruments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 27 44  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability 20 27  
Macro Hedge Program [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 59 132  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability (24) 115  
Derivative Financial Instruments, Assets [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 127    
GMWB Reinsurance [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 28 40  
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverable, Including Reinsurance Premium Paid MODCO 12 12  
Derivative Financial Instruments, Liabilities [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability (240) (84)  
ABS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 383 516  
CDOs      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 997 963  
CMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 1,481 1,407  
Corporate      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 8,020 7,678  
Debt Security, Government, Non-US [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 390 377  
US States and Political Subdivisions Debt Securities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 732 734  
RMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 986 1,033  
Fair Value, Option, Fixed Maturity Securities 11 12  
U.S. Treasuries      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 988 1,131  
Fair Value, Inputs, Level 1 [Member] | Fair Value Measurement [Domain]      
Assets, Fair Value Disclosure [Abstract]      
Separate Account Assets 64,134 59,361  
Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 81 322  
Fair Value, Option, Fixed Maturity Securities 0 0  
Equity Securities, FV-NI 52    
Available-for-sale Securities, Equity Securities   54  
Other Short-term Investments 455 464  
Assets, Fair Value Disclosure 64,722 60,201  
Liabilities, Fair Value Disclosure [Abstract]      
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0  
Fair Value, Inputs, Level 1 [Member] | Liability [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure 0 0  
Fair Value, Inputs, Level 1 [Member] | Guaranteed Minimum Withdrawal Benefit [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure 0 0  
Fair Value, Inputs, Level 1 [Member] | Credit Risk Contract [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 0    
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Derivative Liability 0 0  
Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 0 0  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability 0 0  
Fair Value, Inputs, Level 1 [Member] | US GMWB Hedging Instruments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 0 0  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability 0 0  
Fair Value, Inputs, Level 1 [Member] | Macro Hedge Program [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 0 0  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability 0 0  
Fair Value, Inputs, Level 1 [Member] | GMWB Reinsurance [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 0 0  
Fair Value, Inputs, Level 1 [Member] | Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverable, Including Reinsurance Premium Paid MODCO 0 0  
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability 0 0  
Fair Value, Inputs, Level 1 [Member] | ABS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 0 0  
Fair Value, Inputs, Level 1 [Member] | CDOs      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 0 0  
Fair Value, Inputs, Level 1 [Member] | CMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 0 0  
Fair Value, Inputs, Level 1 [Member] | Corporate      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 0 0  
Fair Value, Inputs, Level 1 [Member] | Debt Security, Government, Non-US [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 0 0  
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 0 0  
Fair Value, Inputs, Level 1 [Member] | RMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 0 0  
Fair Value, Inputs, Level 1 [Member] | U.S. Treasuries      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 81 322  
Fair Value, Inputs, Level 2 [Member] | Fair Value Measurement [Domain]      
Assets, Fair Value Disclosure [Abstract]      
Separate Account Assets 36,134 35,323  
Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 13,132 12,627  
Fair Value, Option, Fixed Maturity Securities 11 12  
Equity Securities, FV-NI 86    
Available-for-sale Securities, Equity Securities   16  
Derivative Asset   44  
Other Short-term Investments 749 380  
Assets, Fair Value Disclosure 50,145 48,414  
Liabilities, Fair Value Disclosure [Abstract]      
Financial and Nonfinancial Liabilities, Fair Value Disclosure 185 181  
Fair Value, Inputs, Level 2 [Member] | Liability [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure 0 0  
Fair Value, Inputs, Level 2 [Member] | Guaranteed Minimum Withdrawal Benefit [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure 0 0  
Fair Value, Inputs, Level 2 [Member] | Credit Risk Contract [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 1    
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 1    
Derivative Liability 97 91  
Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 39 36  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability (114) 110  
Fair Value, Inputs, Level 2 [Member] | US GMWB Hedging Instruments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 4 8  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability 23 18  
Fair Value, Inputs, Level 2 [Member] | Macro Hedge Program [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 0 0  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability 0 0  
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Assets [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 45    
Fair Value, Inputs, Level 2 [Member] | GMWB Reinsurance [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 0 0  
Fair Value, Inputs, Level 2 [Member] | Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverable, Including Reinsurance Premium Paid MODCO 12 12  
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability (185) (181)  
Fair Value, Inputs, Level 2 [Member] | ABS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 381 514  
Fair Value, Inputs, Level 2 [Member] | CDOs      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 899 886  
Fair Value, Inputs, Level 2 [Member] | CMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 1,443 1,366  
Fair Value, Inputs, Level 2 [Member] | Corporate      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 7,778 7,351  
Fair Value, Inputs, Level 2 [Member] | Debt Security, Government, Non-US [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 390 377  
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 732 734  
Fair Value, Inputs, Level 2 [Member] | RMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 602 590  
Fair Value, Inputs, Level 2 [Member] | U.S. Treasuries      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 907 809  
Fair Value, Inputs, Level 3 [Member] | Fair Value Measurement [Domain]      
Assets, Fair Value Disclosure [Abstract]      
Separate Account Assets 55 40  
Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 764 890  
Fair Value, Option, Fixed Maturity Securities 0 0  
Equity Securities, FV-NI 35    
Available-for-sale Securities, Equity Securities   46  
Derivative Asset   168  
Other Short-term Investments 0 0  
Assets, Fair Value Disclosure 964 1,184  
Liabilities, Fair Value Disclosure [Abstract]      
Financial and Nonfinancial Liabilities, Fair Value Disclosure 84 (17)  
Fair Value, Inputs, Level 3 [Member] | Liability [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure (29) (80)  
Fair Value, Inputs, Level 3 [Member] | Guaranteed Minimum Withdrawal Benefit [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Obligations, Fair Value Disclosure (29) (80)  
Fair Value, Inputs, Level 3 [Member] | Credit Risk Contract [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 0    
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Derivative Liability 0 0  
Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 0 0  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability 29 27  
Fair Value, Inputs, Level 3 [Member] | US GMWB Hedging Instruments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 23 36  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability (3) 9  
Fair Value, Inputs, Level 3 [Member] | Macro Hedge Program [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 59 132  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability (24) 115  
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Assets [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Asset 82    
Fair Value, Inputs, Level 3 [Member] | GMWB Reinsurance [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 28 40  
Fair Value, Inputs, Level 3 [Member] | Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance Recoverable, Including Reinsurance Premium Paid MODCO 0 0  
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liability (55) 97  
Fair Value, Inputs, Level 3 [Member] | ABS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 2 2  
Fair Value, Inputs, Level 3 [Member] | CDOs      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 98 77  
Fair Value, Inputs, Level 3 [Member] | CMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 38 41  
Fair Value, Inputs, Level 3 [Member] | Corporate      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 242 327  
Fair Value, Inputs, Level 3 [Member] | Debt Security, Government, Non-US [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 0 0  
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 0 0  
Fair Value, Inputs, Level 3 [Member] | RMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 384 443  
Fair Value, Inputs, Level 3 [Member] | U.S. Treasuries      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 0 0  
Other Liabilities [Member] | Equity Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 1    
Other Liabilities [Member] | Credit Risk Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 3    
Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member] | Credit Risk Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Credit Risk Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 3    
Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 1    
Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Credit Risk Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | CMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 30 1  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale 158 144  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | RMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Debt Securities, Available-for-sale $ 384 426  
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Credit Risk Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   2  
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member] | Credit Risk Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Credit Risk Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   2  
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Credit Risk Contract [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   $ 0