Credit facility maturity extension period description.

No definition available.

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- Definition

Noncash loss on extinguishment of debt.

+ References

No definition available.

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- Definition

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

+ References

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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Balance Type:	credit
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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.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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
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-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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- Definition

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.

+ References

+ Details

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Balance Type:	credit
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- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

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Debt And Related Expenses (Narrative) (Details) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 05, 2018	Jul. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Redemption of senior notes			$ 21,000,000		$ 828,000,000
Loss on early retirement of debt					(312,000,000)
Loss on early retirement of debt, cash retirement costs					$ 304,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Redemption of senior notes				$ 807,000,000
Loss on early retirement of debt				(312,000,000)
Loss on early retirement of debt, cash retirement costs				304,000,000
Loss on early retirement of debt, noncash charges				8,000,000
7.875% due September 30, 2031 [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage			7.875%		7.875%	7.875%
Debt, maturity date					Sep. 30, 2031
7.875% due September 30, 2031 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Redemption of senior notes				$ 384,000,000
Debt interest rate, stated percentage				7.875%
Debt, maturity date				Sep. 30, 2031
7.95% due April 15, 2032 [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage			7.95%		7.95%	7.95%
Debt, maturity date					Apr. 15, 2032
7.95% due April 15, 2032 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Redemption of senior notes				$ 423,000,000
Debt interest rate, stated percentage				7.95%
Debt, maturity date				Apr. 15, 2032
8.25% Due July 1, 2018 [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage			8.25%		8.25%	8.25%
Debt, maturity date					Jul. 01, 2018
8.25% Due July 1, 2018 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Redemption of senior notes		$ 20,000,000
Debt interest rate, stated percentage		8.25%
2012 Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity			$ 3,000,000,000.0		$ 3,000,000,000.0
Outstanding credit facility borrowings			$ 0		$ 0
Debt-to-capitalization ratio			0.215		0.215
Outstanding letters of credit			$ 50,000,000		$ 50,000,000
2018 Revolving Senior Credit Facility [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity	$ 3,000,000,000.0
Credit facility maturity date	Oct. 05, 2023
Credit facility extension period description	The 2018 Senior Credit Facility matures on October 5, 2023, with the option to extend the maturity date by two additional one-year periods.
Maximum [Member] \| 2012 Senior Credit Facility [Member]
Debt Instrument [Line Items]
Debt-to-capitalization ratio			0.65		0.65