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Fair Value Measurements - Separate Account Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financial assets and financial liabilities carried at fair value [Line Items]          
Guaranteed separate accounts $ 507   $ 507   $ 523
Non-guaranteed separate accounts 7,004   7,004   7,126
Subtotal 7,511   7,511   7,649
Non-guaranteed separate accounts priced at NAV as a practical expedient 776   776   774
Total separate account assets 8,287   8,287   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 208   208   215
Non-guaranteed separate accounts 1,392   1,392   1,536
Subtotal 1,600   1,600   1,751
Fair Value Inputs Level 2 [Member]          
Financial assets and financial liabilities carried at fair value [Line Items]          
Guaranteed separate accounts 299   299   308
Non-guaranteed separate accounts 5,356   5,356   5,298
Subtotal 5,655   5,655   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 256   256   292
Subtotal 256   256   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 262 $ 330 292 $ 331  
Policyholder gains (losses) (2) 10 43 37  
Purchases, sales, and settlements:          
Purchases 4 7 12 17  
Sales 0 (17) (72) (52)  
Settlements (8) 0 (12) (1)  
Total purchases, sales, and settlements (4) (10) (72) (36)  
Transfers into/(out of) Level 3:          
Transfers into Level 3 0 1 0 1  
Transfers out of Level 3 0 (15) (7) (17)  
Total transfers into/(out of) Level 3 0 (14) (7) (16)  
Ending Balance $ 256 $ 316 $ 256 $ 316