Debt (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2014
Debt Instrument [Line Items]
Fair value adjustment related to hedged fixed rate debt	$ 4	$ 3
Long-term debt	1,838	1,850
Short-term borrowings	116	106
Total debt	$ 1,954	$ 1,956
Senior Notes 3.2 Percent Due October 1, 2026
Debt Instrument [Line Items]
Debt, interest rate (as a percent)	3.20%	3.20%
Long-term debt	$ 496	$ 496
Senior Notes 4.625 Percent Due November 1, 2020
Debt Instrument [Line Items]
Debt, interest rate (as a percent)	4.625%	4.625%
Aggregate principal Amount			$ 400
Long-term debt	$ 398	$ 398
Senior Notes 1.8 Percent Due September 25, 2017
Debt Instrument [Line Items]
Debt, interest rate (as a percent)	1.80%	1.80%
Aggregate principal Amount	$ 300
Long-term debt	$ 300	$ 299
Senior Notes 6.625 Percent Due April 15, 2037
Debt Instrument [Line Items]
Debt, interest rate (as a percent)	6.625%	6.625%
Long-term debt	$ 254	$ 254
Senior Notes 6.0 Percent Due April 15, 2017
Debt Instrument [Line Items]
Debt, interest rate (as a percent)	6.00%	6.00%
Long-term debt		$ 200
Senior Notes 5.62 Percent Due March 25, 2020
Debt Instrument [Line Items]
Debt, interest rate (as a percent)	5.62%	5.62%
Long-term debt	$ 200	$ 200
Revolving Credit Agreement
Debt Instrument [Line Items]
Long-term debt	$ 186

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

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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- Definition

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

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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.

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

+ References

No definition available.

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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