Contractual interest rate for funds borrowed, under the debt agreement.

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Debt - Senior Notes (Details) - USD ($)	3 Months Ended		9 Months Ended
Debt - Senior Notes (Details) - USD ($)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Jul. 31, 2014
Unsecured Debt
Debt Instrument [Line Items]
Interest expense	$ 46,000,000	$ 32,000,000
Fair value of long-term debt	7,100,000,000		$ 7,100,000,000
Interest Rate Swap \| Designated as Hedging Instrument \| Fair Value Hedging
Debt Instrument [Line Items]
Derivative liability	$ 2,400,000,000		2,400,000,000	$ 2,400,000,000
Senior notes due on 2015 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount repaid			$ 250,000,000
Coupon rate, fixed rate notes	0.70%		0.70%