Derivative Financial Instruments, Gains (Losses) (Details) (Designated as Hedging Instrument [Member], Other Comprehensive Income (Loss) [Member], USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Designated As Accounting Hedges Interest Rate Foreign Currency And Combinations [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (6)		$ (6)		$ 6		$ (4)
Interest Rate Swaps [Member]
Designated As Accounting Hedges Interest Rate Foreign Currency And Combinations [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1)		(1)		(2)		(2)
Foreign Currency Swaps [Member]
Designated As Accounting Hedges Interest Rate Foreign Currency And Combinations [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(4)	[1]	(3)	[1]	0	[1]	(1)	[1]
Interest And Foreign Currency Swaps [Member]
Designated As Accounting Hedges Interest Rate Foreign Currency And Combinations [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (1)		$ (2)		$ 8		$ (1)

[1] Other comprehensive income for foreign currency swaps excludes amounts required to adjust future policy benefits for the run-off settlement annuity business.