Financial Instruments, Derivatives and Hedging Activities - Long-term debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Long-term debt
Long-term debt, Fair value	$ 1,954	$ 1,845
Fair value adjustment related to hedged fixed rate instrument debt instrument, Carrying amount	(1)	1
Total long-term debt	1,931	1,744
3.2% senior notes due October 1, 2026
Long-term debt
Long-term debt, Fair value	462	492
Long-term debt excluding FV adjustment, Carrying amount	$ 496	$ 496
Debt, interest rate (as a percent)	3.20%	3.20%
4.625% senior notes due November 1, 2020
Long-term debt
Long-term debt, Fair value	$ 409	$ 421
Long-term debt excluding FV adjustment, Carrying amount	$ 399	$ 398
Debt, interest rate (as a percent)	4.625%	4.625%
6.625% senior notes due April 15, 2037
Long-term debt
Long-term debt, Fair value	$ 295	$ 325
Long-term debt excluding FV adjustment, Carrying amount	$ 254	$ 254
Debt, interest rate (as a percent)	6.625%	6.625%
5.62% senior notes due March 25, 2020
Long-term debt
Long-term debt, Fair value	$ 205	$ 212
Long-term debt excluding FV adjustment, Carrying amount	$ 200	$ 200
Debt, interest rate (as a percent)	5.62%	5.62%
Term loan credit agreement due April 25, 2019
Long-term debt
Long-term debt, Fair value	$ 165	$ 395
Long-term debt excluding FV adjustment, Carrying amount	165	$ 395
Revolving credit facility
Long-term debt
Long-term debt, Fair value	418
Long-term debt excluding FV adjustment, Carrying amount	$ 418

Represents the carrying amount of an adjustment of fair value related to hedged fixed rate debt.

No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, excluding fair value adjustments related to hedged debt instruments. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 942
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Period Type:	instant

- 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.

+ References

No definition available.

+ Details

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