Derivatives (Fair Value Hedges) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	$ (981)	$ (135)	$ 981
Net Derivatives Gains (Losses) Recognized for Hedged Items	992	127	(1,005)
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	11	(8)	(24)
Interest rate swaps [Member] | Fixed maturity securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	42	(4)	(25)
Net Derivatives Gains (Losses) Recognized for Hedged Items	(43)	0	22
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	(1)	(4)	(3)
Interest rate swaps [Member] | Policyholder account balances [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	(830)	(82)	1,054
Net Derivatives Gains (Losses) Recognized for Hedged Items	835	96	(1,030)
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	5	14	24
Foreign currency swaps [Member] | Foreign-denominated fixed maturity securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	13	(1)	1
Net Derivatives Gains (Losses) Recognized for Hedged Items	(12)	1	3
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	1	0	4
Foreign currency swaps [Member] | Foreign-denominated policyholder account balances [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	(97)	3	(24)
Net Derivatives Gains (Losses) Recognized for Hedged Items	110	(20)	(25)
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	13	(17)	(49)
Foreign currency forwards [Member] | Foreign-denominated fixed maturity securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	(109)	(51)	(25)
Net Derivatives Gains (Losses) Recognized for Hedged Items	102	50	25
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	$ (7)	$ (1)	$ 0