Long Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total	$ 1,659	$ 1,599
Less: current maturities	46	32
Total long-term debt	1,613	1,567
Senior Notes Due February 2019 [Member]
Debt Instrument [Line Items]
Interest Rate	6.50%
Total	55	400
Senior Notes Due February 2021 [Member]
Debt Instrument [Line Items]
Interest Rate	6.75%
Total	350	350
Senior Notes Due September 2021 [Member]
Debt Instrument [Line Items]
Interest Rate	5.375%
Total	450	450
Senior Notes Due September 2023 [Member]
Debt Instrument [Line Items]
Interest Rate	6.00%
Total	300	300
Senior Notes Due December 2024 [Member]
Debt Instrument [Line Items]
Interest Rate	5.50%
Total	425
Other Indebtedness
Debt Instrument [Line Items]
Total	$ 79	$ 99

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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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

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-Section 02

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-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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