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Fair Value Measurements - Separate Account Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financial assets and financial liabilities carried at fair value [Line Items]      
Guaranteed separate accounts $ 506   $ 523
Non-guaranteed separate accounts 6,965   7,126
Subtotal 7,471   7,649
Non-guaranteed separate accounts priced at NAV as a practical expedient 782   774
Total separate account assets 8,253   8,423
Pension Benefits [Member]      
Financial assets and financial liabilities carried at fair value [Line Items]      
Non-guaranteed separate accounts 3,800   3,900
Fair Value Inputs Level 1 [Member]      
Financial assets and financial liabilities carried at fair value [Line Items]      
Guaranteed separate accounts 206   215
Non-guaranteed separate accounts 1,506   1,536
Subtotal 1,712   1,751
Fair Value Inputs Level 2 [Member]      
Financial assets and financial liabilities carried at fair value [Line Items]      
Guaranteed separate accounts 300   308
Non-guaranteed separate accounts 5,197   5,298
Subtotal 5,497   5,606
Fair Value Inputs Level 3 [Member]      
Financial assets and financial liabilities carried at fair value [Line Items]      
Guaranteed separate accounts 0   0
Non-guaranteed separate accounts 262   292
Subtotal 262   292
Fair Value Inputs Level 3 [Member] | Pension Benefits [Member]      
Financial assets and financial liabilities carried at fair value [Line Items]      
Non-guaranteed separate accounts 200   $ 300
Separate Account Assets [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance 292 $ 331  
Policyholder gains (losses) 45 27  
Purchases, sales, and settlements:      
Purchases 8 10  
Sales (72) (35)  
Settlements (4) (1)  
Total purchases, sales, and settlements (68) (26)  
Transfers into/(out of) Level 3:      
Transfers into Level 3 0 0  
Transfers out of Level 3 (7) (2)  
Total transfers into/(out of) Level 3 (7) (2)  
Ending Balance $ 262 $ 330