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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Fair value, assets and liabilities gain (loss) included in earnings $ 24 $ 8  
Fixed income securities 22,401   $ 23,261
Significant unobservable inputs (Level 3)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Assets, fair value disclosure 469   467
Recurring basis | Significant unobservable inputs (Level 3)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Fixed income securities 369   376
Fixed Income Securities Valued Based on Nonbinding Broker Quotes | Significant unobservable inputs (Level 3)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Assets, fair value disclosure 235   $ 237
Contract benefits      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 4 7  
Gain (loss) on investments      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Fair value, assets and liabilities gain (loss) included in earnings 24 8  
Realized capital gains and losses      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 1 1  
(Loss) gain reclassified from AOCI into income (net investment income)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date   5  
Interest credited to contractholder funds      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 19 $ (5)  
Limited partnership interests      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Commitments to invest in limited partnership interests $ 385    
Minimum | Limited partnership interests      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Investment assets, useful life 10 years    
Maximum | Limited partnership interests      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Investment assets, useful life 12 years