The difference between the fair value of the debt instruments and their carrying value.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

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

+ References

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Weighted average interest rate of debt outstanding.

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No definition available.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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No definition available.

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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No definition available.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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Notes Payable and Long-Term Debt (Details)	3 Months Ended	12 Months Ended
Notes Payable and Long-Term Debt (Details)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2019 EUR (€)	Dec. 31, 2018 EUR (€)	Jul. 20, 2016 USD ($)
Long-term debt
Long-term Debt	$ 2,063,000,000	$ 2,081,000,000
Current portion of long-term debt	140,000,000	140,000,000
Long-term debt, net of current portion	$ 1,923,000,000	$ 1,941,000,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time	2.80%	4.30%	2.80%	4.30%
Debt weighted average interest rate	3.40%	3.40%	3.40%	3.40%
Maximum borrowing capacity	$ 1,500,000,000
Estimated fair value of senior unsecured notes	2,071,000,000	$ 2,058,000,000
Debt, difference between fair value and carrying value	17,000,000	(8,000,000)
Letters of Credit Outstanding, Amount	40,000,000	43,000,000
Short Term Borrowings [Member]
Short-term debt
Short-term borrowings	24,000,000	33,000,000
8.00% Senior Notes [Member]
Long-term debt
Long-term Debt	135,000,000	135,000,000
Debt instrument par value	$ 134,000,000	$ 134,000,000
Debt instrument stated interest rate	8.00%	8.00%	8.00%	8.00%
Debt instrument maturity date	Oct. 01, 2019	Oct. 01, 2019
4.625% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 251,000,000	$ 251,000,000
Debt instrument par value	$ 250,000,000	$ 250,000,000
Debt instrument stated interest rate	4.625%	4.625%	4.625%	4.625%
Debt instrument maturity date	Sep. 15, 2020	Sep. 15, 2020
1.80% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 558,000,000	$ 570,000,000
Debt instrument par value \| €			€ 500,000,000	€ 500,000,000
Debt instrument stated interest rate	1.80%	1.80%	1.80%	1.80%
Debt instrument maturity date	Nov. 07, 2022	Nov. 07, 2022
3.375% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 497,000,000	$ 497,000,000
Debt instrument par value	$ 500,000,000	$ 500,000,000
Debt instrument stated interest rate	3.375%	3.375%	3.375%	3.375%
Debt instrument maturity date	Mar. 15, 2025	Mar. 15, 2025
7.125% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 119,000,000	$ 119,000,000
Debt instrument par value	$ 121,000,000	$ 121,000,000
Debt instrument stated interest rate	7.125%	7.125%	7.125%	7.125%
Debt instrument maturity date	Feb. 15, 2029	Feb. 15, 2029
4.375% Senior Notes [Member]
Long-term debt
Long-term Debt	$ 494,000,000	$ 494,000,000
Debt instrument par value	$ 500,000,000	$ 500,000,000
Debt instrument stated interest rate	4.375%	4.375%	4.375%	4.375%
Debt instrument maturity date	Mar. 15, 2045	Mar. 15, 2045
Revolving Credit Facility [Member]
Long-term debt
Current borrowing capacity	$ 1,200,000,000
Term Loan Facilities And Other [Member]
Long-term debt
Long-term Debt	9,000,000	$ 15,000,000
Interest rate swaps
Long-term debt
Derivative, Notional Amount					$ 384,000,000
Commercial Paper [Member]
Long-term debt
Current borrowing capacity	1,200,000,000.0
2016 swap termination event [Member] \| Unamortized portion of interest rate swap \| 4.625% Senior Notes [Member]
Long-term debt
Derivative assets	2,000,000	2,000,000
2009 swap termination event [Member] \| Unamortized portion of interest rate swap \| 8.00% Senior Notes [Member]
Long-term debt
Derivative assets	$ 1,000,000	$ 1,000,000