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				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Designated As Accounting Hedges Interest Rate Foreign Currency And Combinations [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 10		$ 6		$ 12		$ 1
Interest Rate Swaps [Member]
Designated As Accounting Hedges Interest Rate Foreign Currency And Combinations [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0		(1)		(1)		(1)
Foreign Currency Swaps [Member]
Designated As Accounting Hedges Interest Rate Foreign Currency And Combinations [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	[1]	5	[1]	4	[1]	2	[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	$ 10		$ 2		$ 9		$ 0

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