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
	Mar. 31, 2013		Mar. 31, 2012
Designated As Accounting Hedges Interest Rate Foreign Currency And Combinations [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 2		$ (4)
Interest Rate Swaps [Member]
Designated As Accounting Hedges Interest Rate Foreign Currency And Combinations [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1)		0
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]
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)		$ (1)

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