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Fair Value Measurements - Separate Account Assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financial assets and financial liabilities carried at fair value [Line Items]          
Guaranteed separate accounts $ 482   $ 482   $ 523
Non-guaranteed separate accounts 6,945   6,945   7,126
Subtotal 7,427   7,427   7,649
Non-guaranteed separate accounts priced at NAV as a practical expedient 735   735   774
Total separate account assets 8,162   8,162   8,423
Pension Benefits [Member]          
Financial assets and financial liabilities carried at fair value [Line Items]          
Non-guaranteed separate accounts 3,900   3,900   3,900
Fair Value Inputs Level 1 [Member]          
Financial assets and financial liabilities carried at fair value [Line Items]          
Guaranteed separate accounts 206   206   215
Non-guaranteed separate accounts 1,335   1,335   1,536
Subtotal 1,541   1,541   1,751
Fair Value Inputs Level 2 [Member]          
Financial assets and financial liabilities carried at fair value [Line Items]          
Guaranteed separate accounts 276   276   308
Non-guaranteed separate accounts 5,353   5,353   5,298
Subtotal 5,629   5,629   5,606
Fair Value Inputs Level 3 [Member]          
Financial assets and financial liabilities carried at fair value [Line Items]          
Guaranteed separate accounts 0   0   0
Non-guaranteed separate accounts 257   257   292
Subtotal 257   257   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   200   $ 300
Separate Account Assets [Member]          
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]          
Beginning Balance 256 $ 316 292 $ 331  
Policyholder gains (losses) (1) (1) 42 36  
Purchases, sales, and settlements:          
Purchases 8 9 20 26  
Sales (1) 0 (73) (52)  
Settlements (9) (12) (21) (13)  
Total purchases, sales, and settlements (2) (3) (74) (39)  
Transfers into/(out of) Level 3:          
Transfers into Level 3 12 4 12 5  
Transfers out of Level 3 (8) (16) (15) (33)  
Total transfers into/(out of) Level 3 4 (12) (3) (28)  
Ending Balance $ 257 $ 300 $ 257 $ 300