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Fair Value Measurements Level 4 Fair Value Level 3 Roll Forward (Details) - USD ($)
$ in Millions
 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, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ 1 $ (1) $ (31) $ 0        
Available-for-sale Equity Securities, Amortized Cost Basis 89   89     $ 471    
Available-for-sale Securities, Debt Securities 25,625   25,625     24,657    
Reinsurance Recoverables 20,606   20,606     20,499    
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Marketable Securities, Fixed Maturities 112   112     165    
Trading Securities, Equity 11   11     11    
Available-for-sale Securities, Equity Securities 99   99     459    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 923   923     941    
Other Short-term Investments 737   737     572    
Alternative Investments, Fair Value Disclosure 966   966     1,216    
Separate Account Assets 118,648   118,648     120,111    
Assets, Fair Value Disclosure 143,152   143,152     144,439    
Asset-backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,049   1,049     846    
Available-for-sale Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Equity Securities, Amortized Cost Basis 89   89          
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Available-for-sale Securities, Equity Securities 99   99     178    
Residential Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,782   1,782     1,503    
US States and Political Subdivisions Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,289   1,289     1,132    
Foreign Government Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 338   338     331    
Corporate Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 15,593   15,593     15,175    
Commercial Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 2,269   2,269     1,964    
Collateralized Debt Obligations [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,209   1,209     1,408    
Separate Accounts [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)       3        
Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0 0 (34) 2        
Available-for-sale Equity Securities, Amortized Cost Basis 0   0     293    
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Available-for-sale Securities, Equity Securities 0   0     281    
Other Liabilities [Member] | Interest Rate Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net (451)   (451)          
Other Liabilities [Member] | Equity Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net 30   30          
Other Liabilities [Member] | Credit Risk Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Equity Linked Notes [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 31   31     26    
Liability [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 379   379     288    
Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (379)   (379)   $ 440 288    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   31   32        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 7 1 23 56        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 325 164 325 164 171 139 $ 285 $ 112
Available-for-sale Securities, Debt Securities 1,776   1,776     1,625    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1 28 1 29        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 1 (2) (5)          
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Marketable Securities, Fixed Maturities 0   0     2    
Trading Securities, Equity 0   0     0    
Available-for-sale Securities, Equity Securities 43   43     38    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 291   291     193    
Other Short-term Investments 0   0     0    
Assets, Fair Value Disclosure 2,419   2,419     2,046    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 165 57 226 317        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 3 6 12 16        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 (11) (200) (27) (226)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 10 1 16 7        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 78   (41)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)     0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (17)   (50)          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 78   (41)          
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 20   20     5    
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 743   743     628    
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 79   79     49    
Fair Value, Inputs, Level 3 [Member] | Foreign Government Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 20   20     17    
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 635   635     534    
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 23   23     62    
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 256   256     330    
Fair Value, Inputs, Level 3 [Member] | Reinsurance Recoverable [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)     4          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 98   98     83    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings     4          
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements     11          
Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) (68) 60 (38)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3     6          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 265 328 265 328   253 267  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings   61 (59)          
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases     71          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements     (6)          
Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   1   2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3   1 2 11        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 47 0 47 0 2 72 84
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings       (4)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (1)   (1)        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases     1 5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   25   23        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     (1) (5)        
Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member] | Derivative [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss)   (2) (5) (4)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (34) (30) (34) (30) (34) (29) (28) (27)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings   (2) (5) (2)        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements       (1)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   0   0        
Fair Value, Inputs, Level 3 [Member] | Equity Contract [Member] | Derivative [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss)       1        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 0 0 0 0 1 0 3 5
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (1) (3) (8) 5        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases     8          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements       (10)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   0   0        
Fair Value, Inputs, Level 3 [Member] | Credit Risk Contract [Member] | Derivative [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss)       3        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3       10        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   0   0     0 (3)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings       1        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases       (8)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements       0        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   0   0        
Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member] | Derivative [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss)   2   (2)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3   0            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   4   4     2 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings   2   (2)        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements       0        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   0   0        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3   0   6        
Fair Value, Inputs, Level 3 [Member] | Other Contract [Member] | Derivative [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss)       27        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3       10        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 265 328 265 328 273     286
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (67)     18        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 63     39        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 4     (31)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   0   0        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3       6        
Fair Value, Inputs, Level 3 [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net (34)   (34)          
Fair Value, Inputs, Level 3 [Member] | Other Liabilities [Member] | Equity Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Fair Value, Inputs, Level 3 [Member] | Other Liabilities [Member] | Credit Risk Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Fair Value, Inputs, Level 3 [Member] | Equity Linked Notes [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (31)   (31)   28 26    
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 31   31     26    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (3)   (5)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)     0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0   0          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) (3)   (5)          
Fair Value, Inputs, Level 3 [Member] | Liability [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 379   379     288    
Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 114   114     123    
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Marketable Securities, Fixed Maturities 0   0     1    
Trading Securities, Equity 11   11     11    
Available-for-sale Securities, Equity Securities 20   20     396    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0   0     0    
Other Short-term Investments 255   255     131    
Assets, Fair Value Disclosure 75,270   75,270     78,761    
Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Fair Value, Inputs, Level 1 [Member] | Residential Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Fair Value, Inputs, Level 1 [Member] | Collateralized Debt Obligations [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Fair Value, Inputs, Level 1 [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Fair Value, Inputs, Level 1 [Member] | Other Liabilities [Member] | Equity Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Fair Value, Inputs, Level 1 [Member] | Other Liabilities [Member] | Credit Risk Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Fair Value, Inputs, Level 1 [Member] | Equity Linked Notes [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 0   0     0    
Fair Value, Inputs, Level 1 [Member] | Liability [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 0   0     0    
Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 23,735   23,735     22,909    
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Marketable Securities, Fixed Maturities 112   112     162    
Trading Securities, Equity 0   0     0    
Available-for-sale Securities, Equity Securities 36   36     25    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 632   632     748    
Other Short-term Investments 482   482     441    
Assets, Fair Value Disclosure 64,523   64,523     62,408    
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,029   1,029     841    
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,039   1,039     875    
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,210   1,210     1,083    
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 318   318     314    
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 14,958   14,958     14,641    
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 2,246   2,246     1,902    
Fair Value, Inputs, Level 2 [Member] | Collateralized Debt Obligations [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 953   953     1,078    
Fair Value, Inputs, Level 2 [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net (417)   (417)          
Fair Value, Inputs, Level 2 [Member] | Other Liabilities [Member] | Equity Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net 30   30          
Fair Value, Inputs, Level 2 [Member] | Other Liabilities [Member] | Credit Risk Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net 0   0          
Fair Value, Inputs, Level 2 [Member] | Equity Linked Notes [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 0   0     0    
Fair Value, Inputs, Level 2 [Member] | Liability [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 0   0     0    
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   (4)            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3       3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 43 45 43 45 42 38 44 48
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (1) (4) (1) 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   (3) (4) (1)        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2 2 4 5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   0 (2) (8)        
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (11) (12) (12) (13)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 162 43 305 269        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1,776 1,615 1,776 1,615 1,786 1,625 1,722 2,025
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (11) (10) (19) (14)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (31) 12 (34) 34        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 155 46 371 132        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 46 48 236 169        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 (33) (67) (72) (162)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 56 27 378 106        
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | Asset-backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 1 9 4 92        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 20 5 20 5 7 5 14 82
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)       2        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 17   17 22        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 1   1          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 (2)   (2) (6)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     5 1        
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | Residential Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3     10 19        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 743 597 743 597 690 628 662 734
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings       (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (5) 3 (3) 2        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 93 22 241 68        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 37 33 113 91        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 (8) (51) (8) (108)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     2 16        
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | US States and Political Subdivisions Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 79 50 79 50 73 49 49 54
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (2) (1) (6) 4        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 4   16          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     8          
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | Foreign Government Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 20 16 20 16 18 17 15 30
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (1) 1 (3) 3        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 5   8 3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 1   3 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 (3) (1) (5) (15)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   3   3        
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | Corporate Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (11) (12) (12) (11)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 158 29 233 122        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 635 540 635 540 717 534 547 646
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (11) (10) (18) (12)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (25)   (29) 26        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 22 19 56 22        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 4 4 41 20        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 (20) (15) (55) (30)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 56 24 363 82        
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)       (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 3 5 58 30        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 23 74 23 74 15 62 87 119
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   1 1 2        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 14 5 33 17        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 3 12 11 31        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     (2) (3)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3       4        
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | Collateralized Debt Obligations [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)       (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3       6        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 256 333 256 333 266 330 348 360
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings     (1) (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 2 8 6 (5)        
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 8 7 67 25        
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           (431)    
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Equity Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           41    
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Credit Risk Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           (7)    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 743   743     628    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 17   17     61    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Policyholder Funds and Benefits Payable [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   291   291     138 165
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings   (172)   (113)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   19   (13)        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)   (172)   (113)        
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Liabilities [Member] | Embedded Derivative Financial Instruments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   0   0     3 3
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings   3   3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   0   0        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)   3   3        
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           (29)    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Liabilities [Member] | Equity Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Liabilities [Member] | Credit Risk Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Linked Notes [Member] | Other Policyholder Funds and Benefits Payable [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   21   21     26  
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings   5            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   0            
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)   5            
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Liabilities [Member] | Equity Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Liabilities [Member] | Credit Risk Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           (402)    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Liabilities [Member] | Equity Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           41    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Liabilities [Member] | Credit Risk Contract [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Derivative Assets (Liabilities), at Fair Value, Net           (7)    
Guaranteed Minimum Withdrawal Benefit [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 348   348     262    
Guaranteed Minimum Withdrawal Benefit [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (348)   (348)   412 262    
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 348   348     262    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 81   (36)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (17)   (50)          
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 81   (36)          
Guaranteed Minimum Withdrawal Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Other Policyholder Funds and Benefits Payable [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   270   270     112 139
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings   (177)   (118)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   19   (13)        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)   (177)   (118)        
Guaranteed Minimum Withdrawal Benefit [Member] | Fair Value, Inputs, Level 1 [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 0   0     0    
Guaranteed Minimum Withdrawal Benefit [Member] | Fair Value, Inputs, Level 2 [Member]                
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Obligations, Fair Value Disclosure 0   0     $ 0    
Equity Linked Notes [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Policyholder Funds and Benefits Payable [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   21   21       26
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings       5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements       0        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)       5        
Reinsurance Recoverable [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (12)              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 98   $ 98   $ 106      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (12)              
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements $ 4              
Reinsurance Recoverable [Member] | Guaranteed Minimum Withdrawal Benefit [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   46   31        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   73   73     $ 50 $ 56
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   46   31        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)   0            
Roll Forward of Financial Instruments (Assets) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   $ 23   $ 14