Fair Value (Quantitative Information) (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Interest rate contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Swap yield	3.24%	2.48%
Interest rate contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Swap yield	3.51%	4.50%
Foreign currency exchange rate contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Swap yield	(0.12%)	0.97%
Correlation	43.00%	38.00%
Foreign currency exchange rate contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Swap yield	10.12%	7.67%
Correlation	55.00%	47.00%
Credit contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spreads	0.98%	0.98%
Credit contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spreads	1.01%	1.01%
Equity market contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Correlation	65.00%	60.00%
Volatility	14.00%	13.00%
Equity market contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Correlation	65.00%	60.00%
Volatility	28.00%	28.00%
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	0.28%	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%	0.04%
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%	0.00%
Long-term equity volatilities	7.30%	9.14%
Nonperformance risk spread	(0.16%)	(1.08%)
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	20.00%	40.00%
Long-term equity volatilities	33.00%	40.00%
Nonperformance risk spread	0.77%	0.83%
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	(0.20%)	(0.10%)
Illiquidity premium	0.30%	0.30%
Offered quotes	$ 31	$ 33
Quoted prices	$ 0
Matrix Pricing - Offered quotes	$ 0	$ 4
Credit spreads	(14.71%)	(14.89%)
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	2.50%	2.40%
Illiquidity premium	0.30%	0.30%
Offered quotes	$ 126	$ 145
Quoted prices	$ 750
Matrix Pricing - Offered quotes	$ 121	$ 145
Credit spreads	31.17%	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	0.51%	0.46%
Illiquidity premium	0.30%	0.30%
Offered quotes	$ 107	$ 95
Quoted prices	$ 158
Matrix Pricing - Offered quotes	$ 92	$ 100
Credit spreads	1.84%	1.74%
Foreign government debt securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 66	$ 84
Quoted prices	$ 1	$ 64
Credit spreads	0.48%	0.04%
Foreign government debt securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 122	$ 156
Quoted prices	$ 163	$ 156
Credit spreads	0.48%	0.72%
Foreign government debt securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 108	$ 107
Quoted prices	$ 81	$ 100
Credit spreads	0.48%	0.32%
RMBS [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 1	$ 69
Quoted prices	$ 22	$ 10
Credit spreads	0.45%	(1.36%)
RMBS [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 116	$ 101
Quoted prices	$ 120	$ 109
Credit spreads	4.13%	36.09%
RMBS [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 93	$ 93
Quoted prices	$ 95	$ 98
Credit spreads	2.25%	2.88%
CMBS [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 100	$ 90
Quoted prices	$ 5	$ 70
Credit spreads		2.15%
CMBS [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 100	$ 101
Quoted prices	$ 112	$ 104
Credit spreads		20.25%
CMBS [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 100	$ 95
Quoted prices	$ 101	$ 97
Credit spreads		4.09%
ABS [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 100	$ 56
Quoted prices	$ 0	$ 0
Credit spreads	0.31%	0.30%
ABS [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 100	$ 106
Quoted prices	$ 110	$ 110
Credit spreads	18.78%	18.78%
ABS [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Offered quotes	$ 100	$ 98
Quoted prices	$ 100	$ 101
Credit spreads	1.52%	1.45%