Debt and Interest Costs - Long term debt (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Long-term debt
Long-term Debt, Gross	$ 7,500	$ 7,400
Other (including debt issuance costs)	(44)	(45)
Long-term debt, Total	7,555	7,389
Less: Current portion of long-term debt	(79)	(79)
Long-term debt excluding current maturities	7,476	7,310
Senior Notes 5.25 Percent, due July 2025
Long-term debt
Long-term Debt, Gross	$ 1,000	$ 1,000
Interest rate (as a percent)	5.25%	5.25%
Senior Notes 4.375 Percent, due December 2020
Long-term debt
Long-term Debt, Gross	$ 1,000	$ 1,000
Interest rate (as a percent)	4.375%	4.375%
Senior Notes 4.00 Percent, due November 2023
Long-term debt
Long-term Debt, Gross	$ 1,000	$ 1,000
Interest rate (as a percent)	4.00%	4.00%
Senior Notes 4.375 Percent, euro denominated, due December 2023
Long-term debt
Long-term Debt, Gross	$ 746	$ 736
Interest rate (as a percent)	4.375%	4.375%
Senior Notes 5.00 Percent, due March 2022
Long-term debt
Long-term Debt, Gross	$ 750	$ 750
Interest rate (as a percent)	5.00%	5.00%
Senior Notes 3.50 Percent, euro denominated, due December 2020
Long-term debt
Long-term Debt, Gross	$ 426	$ 421
Interest rate (as a percent)	3.50%	3.50%
Term A Loan, due June 2021
Long-term debt
Long-term Debt, Gross	$ 1,365	$ 1,383
Term A Loan, Euro denominated, due June 2021
Long-term debt
Long-term Debt, Gross	967	954
Multi-currency USD revolver, due March 2021
Long-term debt
Long-term Debt, Gross	$ 345	$ 190

Net total of debt issuance costs, debt discount (premium) and other long term debt not elsewhere specified.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
-Paragraph 1
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Contractual interest rate for funds borrowed, under the debt agreement.

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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
-Section S99
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-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

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