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Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Assets Fair Value Disclosure [Abstract]    
Assets Fair Value Disclosure $ 235,024 $ 224,673
Liabilities Fair Value Disclosure [Abstract]    
Liabilities measured at fair value (3,292) (4,397)
Significant Unobservable Inputs (Level 3) [Member]    
Assets Fair Value Disclosure [Abstract]    
Assets Fair Value Disclosure 4,008 3,747
Liabilities Fair Value Disclosure [Abstract]    
Liabilities measured at fair value (1,684) $ (2,202)
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Corporate bonds [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Assets Fair Value Disclosure $ 1,885  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Corporate bonds [Member] | Maximum [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Liquidity Duration Adjustment 41.90%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Corporate bonds [Member] | Minimum [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Liquidity Duration Adjustment 0.70%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | ABS [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Assets Fair Value Disclosure $ 25  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | ABS [Member] | Maximum [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Liquidity Duration Adjustment 3.00%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | ABS [Member] | Minimum [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Liquidity Duration Adjustment 3.00%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Foreign government bonds [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Assets Fair Value Disclosure $ 78  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Foreign government bonds [Member] | Maximum [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Liquidity Duration Adjustment 3.60%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Foreign government bonds [Member] | Minimum [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Liquidity Duration Adjustment 1.80%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Hybrid and redeemable preferred securities [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Assets Fair Value Disclosure $ 4  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Hybrid and redeemable preferred securities [Member] | Maximum [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Liquidity Duration Adjustment 1.90%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Hybrid and redeemable preferred securities [Member] | Minimum [Member] | Fixed maturity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Liquidity Duration Adjustment 1.90%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Equity AFS securities [Member]    
Assets Fair Value Disclosure [Abstract]    
Assets Fair Value Disclosure $ 25  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Equity AFS securities [Member] | Maximum [Member]    
Assets Fair Value Disclosure [Abstract]    
Liquidity Duration Adjustment 5.00%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Equity AFS securities [Member] | Minimum [Member]    
Assets Fair Value Disclosure [Abstract]    
Liquidity Duration Adjustment 4.50%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Other assets [Member]    
Assets Fair Value Disclosure [Abstract]    
Assets Fair Value Disclosure $ 383  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Maximum [Member] | Other assets [Member]    
Fair Value Inputs [Abstract]    
Lapse Rate 30.00%  
Utilization of guaranteed withdrawal 100.00%  
Claims Utilization Factor 100.00%  
Premiums Utilization Factor 115.00%  
NPR 0.33%  
Volatility 29.00%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | GLB direct and ceded embedded derivatives [Member] | Minimum [Member] | Other assets [Member]    
Fair Value Inputs [Abstract]    
Lapse Rate 1.00%  
Utilization of guaranteed withdrawal 85.00%  
Claims Utilization Factor 60.00%  
Premiums Utilization Factor 80.00%  
NPR 0.01%  
Volatility 1.00%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives [Member]    
Liabilities Fair Value Disclosure [Abstract]    
Liabilities measured at fair value $ (1,268)  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives [Member] | Maximum [Member]    
Fair Value Inputs [Abstract]    
Lapse Rate 9.00%  
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flow Valuation Technique [Member] | Future contract benefits - indexed annuity and IUL contracts embedded derivatives [Member] | Minimum [Member]    
Fair Value Inputs [Abstract]    
Lapse Rate 1.00%