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Fair Value Measurements - Separate Account Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Financial assets and financial liabilities carried at fair value [Line Items]    
Guaranteed separate accounts $ 500 $ 509
Non-guaranteed separate accounts [1] 6,584 6,396
Subtotal 7,084 6,905
Non-guaranteed separate accounts priced at NAV as a practical expedient [1] 856 928
Total separate account assets 7,940 7,833
Pension Benefits [Member]    
Financial assets and financial liabilities carried at fair value [Line Items]    
Non-guaranteed separate accounts priced at NAV as a practical expedient 900 900
Non-guaranteed separate accounts 3,700 3,600
Fair Value Inputs Level 1 [Member]    
Financial assets and financial liabilities carried at fair value [Line Items]    
Guaranteed separate accounts 238 235
Non-guaranteed separate accounts 1,368 1,401
Subtotal 1,606 1,636
Fair Value Inputs Level 2 [Member]    
Financial assets and financial liabilities carried at fair value [Line Items]    
Guaranteed separate accounts 262 274
Non-guaranteed separate accounts 4,885 4,698
Subtotal 5,147 4,972
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 331 297
Subtotal 331 297
Fair Value Inputs Level 3 [Member] | Pension Benefits [Member]    
Financial assets and financial liabilities carried at fair value [Line Items]    
Non-guaranteed separate accounts 300 300
Separate Account Assets [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 297 255
Policyholder gains (losses) 2 (6)
Purchases, sales, and settlements:    
Purchases 22 59
Sales (11) 0
Settlements (18) (16)
Total purchases, sales, and settlements (7) 43
Transfers into/(out of) Level 3:    
Transfers into Level 3 65 17
Transfers out of Level 3 (26) (12)
Total transfers into/(out of) Level 3 39 5
Ending Balance $ 331 $ 297
[1] Non-guaranteed separate accounts included $3.7 billion as of December 31, 2016 and $3.6 billion as of December 31, 2015 in assets supporting the Company's pension plans, including $0.3 billion classified in Level 3 and $0.9 billion priced at NAV as a practical expedient for both periods.