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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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Nominal or face amount used to calculate payments on the derivative liability.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959

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Gross amount of debt extinguished.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
-Paragraph 2
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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Debt - Senior Notes (Details) - USD ($) $ in Millions	12 Months Ended
Debt - Senior Notes (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Jul. 31, 2014
Fair Value Hedging \| Interest Rate Swap \| Designated as Hedging Instrument
Debt Instrument [Line Items]
Derivative liability	$ 2,400		$ 2,400
Senior Notes
Debt Instrument [Line Items]
Interest expense	178	$ 137
Fair value of long-term debt	6,500
Senior Notes \| Senior notes due 2015
Debt Instrument [Line Items]
Aggregate principal amount repaid	$ 250
Coupon rate, fixed rate notes	0.70%
Senior Notes \| Senior notes due 2015
Debt Instrument [Line Items]
Aggregate principal amount repaid	$ 600
Coupon rate, fixed rate notes	1.625%