Indebtedness - Schedule of Debt, Net of Unamortized Discount and Debt Issuance Cost (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument
Total debt	$ 3,026	$ 4,041
Less: short-term debt and current portion of long-term debt	139	151
Total long-term debt	2,887	3,890
6.0% Notes due June 2018
Debt Instrument
Total debt	200	255
7.5% Senior Notes due November 2018
Debt Instrument
Total debt	524	747
3.2% Senior Notes due August 2021
Debt Instrument
Total debt	511	746
8.55% Debentures due June 2024
Debt Instrument
Total debt	112	149
6.875% Notes due January 2029
Debt Instrument
Total debt	302	394
5.125% Notes due September 2040
Debt Instrument
Total debt	1,132	1,482
Other debt
Debt Instrument
Total debt	$ 245	$ 268

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section H

+ Details

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