Derivatives (Fair Value Hedges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	$ (119)	$ (9)	$ 208	$ (684)
Net Derivatives Gains (Losses) Recognized for Hedged Items	110	14	(200)	689
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	(9)	5	8	5
Interest rate swaps [Member] | Fixed maturity securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	9	(3)	7	35
Net Derivatives Gains (Losses) Recognized for Hedged Items	(8)	3	(5)	(35)
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	1	0	2	0
Interest rate swaps [Member] | Policyholder account balances [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	43	(102)	389	(638)
Net Derivatives Gains (Losses) Recognized for Hedged Items	(44)	105	(379)	638
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	(1)	3	10	0
Foreign currency swaps [Member] | Foreign-denominated fixed maturity securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	12	(7)	5	10
Net Derivatives Gains (Losses) Recognized for Hedged Items	(12)	6	(5)	(10)
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	0	(1)	0	0
Foreign currency swaps [Member] | Foreign-denominated policyholder account balances [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	(134)	103	(160)	(91)
Net Derivatives Gains (Losses) Recognized for Hedged Items	129	(100)	158	96
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	(5)	3	(2)	5
Foreign currency forwards [Member] | Foreign-denominated fixed maturity securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	(49)	0	(33)	0
Net Derivatives Gains (Losses) Recognized for Hedged Items	45	0	31	0
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	$ (4)	$ 0	$ (2)	$ 0