Fair Value (Quantitative Information) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Interest rate contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Swap yield	2.48%	1.86%
Interest rate contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Swap yield	4.50%	3.53%
Foreign currency exchange rate contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Swap yield	0.97%	2.28%
Correlation	38.00%	43.00%
Foreign currency exchange rate contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Swap yield	7.67%	7.95%
Correlation	47.00%	57.00%
Credit contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spreads	0.98%	1.00%
Credit contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spreads	1.01%	1.00%
Equity market contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Correlation	60.00%	65.00%
Volatility	13.00%	13.00%
Equity market contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Correlation	60.00%	65.00%
Volatility	28.00%	32.00%
Embedded derivatives direct and assumed guaranteed minimum benefits [Member] | Income Approach Valuation Technique [Member] | Durations 1-10 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Lapse Rate, Low End	0.50%	0.50%
Lapse Rate, High End	100.00%	100.00%
Embedded derivatives direct and assumed guaranteed minimum benefits [Member] | Income Approach Valuation Technique [Member] | Durations 11-20 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Lapse Rate, Low End	2.00%	2.00%
Lapse Rate, High End	100.00%	100.00%
Embedded derivatives direct and assumed guaranteed minimum benefits [Member] | Income Approach Valuation Technique [Member] | Durations 21-116 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Lapse Rate, Low End	2.00%	2.00%
Lapse Rate, High End	100.00%	100.00%
Embedded derivatives direct and assumed guaranteed minimum benefits [Member] | Income Approach Valuation Technique [Member] | Ages 0-40 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortality Rate, Low End	0.00%	0.00%
Mortality Rate, High End	0.14%	0.14%
Embedded derivatives direct and assumed guaranteed minimum benefits [Member] | Income Approach Valuation Technique [Member] | Ages 41-60 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortality Rate, Low End	0.04%	0.05%
Mortality Rate, High End	0.88%	0.88%
Embedded derivatives direct and assumed guaranteed minimum benefits [Member] | Income Approach Valuation Technique [Member] | Ages 61-115 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortality Rate, Low End	0.26%	0.26%
Mortality Rate, High End	100.00%	100.00%
Embedded derivatives direct and assumed guaranteed minimum benefits [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Utilization rates	20.00%	20.00%
Withdrawal rates	0.00%	0.07%
Long-term equity volatilities	9.14%	15.18%
Nonperformance risk spread	(1.08%)	0.10%
Embedded derivatives direct and assumed guaranteed minimum benefits [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Utilization rates	50.00%	50.00%
Withdrawal rates	40.00%	20.00%
Long-term equity volatilities	40.00%	40.00%
Nonperformance risk spread	0.83%	1.72%
U.S. corporate and foreign corporate securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Delta spread adjustments	(0.10%)	(0.50%)
Illiquidity premium	0.30%	0.30%
Offered quotes	$ 33	$ 0
Matrix Pricing - Offered quotes	$ 4	$ 0
Credit spreads	(14.89%)	(14.16%)
U.S. corporate and foreign corporate securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Delta spread adjustments	2.40%	5.00%
Illiquidity premium	0.30%	0.30%
Offered quotes	$ 145	$ 555
Matrix Pricing - Offered quotes	$ 145	$ 348
Credit spreads	8.76%	8.76%
U.S. corporate and foreign corporate securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Delta spread adjustments	0.46%	0.90%
Illiquidity premium	0.30%	0.30%
Offered quotes	$ 95	$ 92
Matrix Pricing - Offered quotes	$ 100	$ 115
Credit spreads	1.74%	2.72%
Foreign government debt securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 84	$ 82
Quoted prices	$ 64	$ 77
Credit spreads	0.04%	(0.58%)
Foreign government debt securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 156	$ 200
Quoted prices	$ 156	$ 146
Credit spreads	0.72%	1.50%
Foreign government debt securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 107	$ 117
Quoted prices	$ 100	$ 99
Credit spreads	0.32%	0.72%
RMBS [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 69	$ 28
Quoted prices	$ 10	$ 13
Credit spreads	(1.36%)	0.09%
RMBS [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 101	$ 100
Quoted prices	$ 109	$ 109
Credit spreads	36.09%	29.80%
RMBS [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 93	$ 75
Quoted prices	$ 98	$ 100
Credit spreads	2.88%	5.21%
CMBS [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 90
Quoted prices	$ 70	$ 1
Credit spreads	2.15%	0.01%
CMBS [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 101
Quoted prices	$ 104	$ 106
Credit spreads	20.25%	91.64%
CMBS [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 95
Quoted prices	$ 97	$ 99
Credit spreads	4.09%	3.74%
ABS [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 56	$ 0
Quoted prices	$ 0	$ 40
Credit spreads	0.30%	0.00%
ABS [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 106	$ 111
Quoted prices	$ 110	$ 105
Credit spreads	18.78%	18.29%
ABS [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 98	$ 97
Quoted prices	$ 101	$ 100
Credit spreads	1.45%	1.09%