Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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Amount of interest payable on debt, including, but not limited to, trade payables.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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- Definition

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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No definition available.

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Debt - Unsecured Senior Notes and Interest Expense and Financing Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Gross Carrying Amount	$ 4,440		$ 4,940
Interest expense	35	$ 53
Amortization of financing costs and discounts	7	$ 4
Notes
Debt Instrument [Line Items]
Interest payable	4		25
Unsecured Debt \| 2021 Notes
Debt Instrument [Line Items]
Gross Carrying Amount	$ 650		$ 650
Interest rate	2.30%		2.30%
Unsecured Debt \| 2021 Notes \| Fair value measurements using significant other observable inputs (Level 2)
Debt Instrument [Line Items]
Fair value of notes	$ 636		$ 635
Unsecured Debt \| 2023 Notes
Debt Instrument [Line Items]
Gross Carrying Amount	$ 750		$ 750
Interest rate	6.125%		6.125%
Unsecured Debt \| 2023 Notes \| Fair value measurements using significant other observable inputs (Level 2)
Debt Instrument [Line Items]
Fair value of notes	$ 812		$ 818
Unsecured Debt \| 2026 Notes
Debt Instrument [Line Items]
Gross Carrying Amount	$ 850		$ 850
Interest rate	3.40%		3.40%
Unsecured Debt \| 2026 Notes \| Fair value measurements using significant other observable inputs (Level 2)
Debt Instrument [Line Items]
Fair value of notes	$ 830		$ 808