Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Anticipated pre-tax loss reclassified from accumulated other comprehensive income (loss) to earnings	$ 13
MaxLengthOfTimeHedgedInCashFlowHedge	29 years
Net investment hedges income (loss) before taxes	411	356
Notional of credit derivative	500	500
Fair value of credit derivative liability	(5)	(4)
Credit protection derivatives outstanding notional amounts	894	1,399
CreditDerivativePurchasedCreditProtection	(28)	(42)
Single Name [Member]
Derivative [Line Items]
Credit Derivatives Written Max Length Of Maturities	2 years
Credit Default Index [Member]
Derivative [Line Items]
Credit Derivatives Written Max Length Of Maturities	10 years
Moodys Baa1 Rating [Member] | Single Name [Member]
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	7	5
Credit Risk Derivatives, at Fair Value, Net	1	1
Moodys Ba1 Rating [Member] | Credit Default Index [Member]
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	251
Credit Risk Derivatives, at Fair Value, Net	$ (1)