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Available commercial paper.

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Debt Instrument, Covenant, Distributions Limits

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Debt Instrument, Covenant, Leverage Ratio

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Debt Instrument, Leverage Ratio

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Debt Tender Offer, Maximum Aggregate Purchase Price

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Extended Financing Agreement Term

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Line of credit facility aggregate commitment amount.

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Line Of Credit Facility, Committed Amount

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Line Of Credit Facility, Number Of Extension Options

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Line of Credit Facility, Maximum Borrowing Capacity, If Adding New Lenders

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Maximum potential lien on assets located in specified regions.

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Number Of Credit Facilities Terminated

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Percentage of liens of companies consolidated asset.

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Period for borrowing funds.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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

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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.

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Fair value amount of debt instrument that was repurchased.

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Face (par) amount of the original debt instrument that was repurchased.

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Amount, after accumulated amortization, of debt discount.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after accumulated amortization, of debt premium.

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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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.

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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Indebtedness divided by net capital.

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DEBT AND FINANCING COSTS - Additional Information (Details) £ in Millions		1 Months Ended						12 Months Ended
	Jun. 21, 2019 USD ($)	Feb. 28, 2019 USD ($) contract	Feb. 28, 2019 GBP (£) contract	Nov. 30, 2018 USD ($) contract	Aug. 31, 2018 USD ($)	Mar. 31, 2018	Jan. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 19, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 GBP (£)	Jan. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Debt instrument repurchase program															$ 250,000,000
Loss from extinguishment of debt							$ 1,000,000	$ 75,000,000	$ 94,000,000	$ 1,000,000
Line of credit outstanding								0	0
Number of credit facilities terminated \| contract		2	2
Write off of deferred debt issuance cost		$ 4,000,000
Commercial paper program								3,500,000,000
Unamortized discount								42,000,000	44,000,000
Discount of debt amortization								2,000,000	3,000,000	$ 3,000,000
Senior Notes
Debt Instrument [Line Items]
Debt repurchased principle amount	$ 932,000,000				$ 731,000,000
Loss from extinguishment of debt	75,000,000				94,000,000
Extinguishment of debt amount	1,000,000,000.0				828,000,000
Unamortized debt issuance costs and discount	$ 7,000,000				5,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum potential lien on assets located in specified regions								$ 2,400,000,000
Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Percentage of liens of companies consolidated asset								15.00%
Commercial paper
Debt Instrument [Line Items]
Period for borrowing funds								270 days
Short-term debt outstanding								$ 0	$ 0
2015 Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Quarterly facility fees at per annum rate								0.175%
2015 Credit Facility \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Debt-to-capital ratio									0.60				0.60
2015 Credit Facility \| Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Margin percentage								0.075%
2015 Credit Facility \| Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Margin percentage								1.075%
Senior Notes
Debt Instrument [Line Items]
Debt repurchased principle amount							69,000,000
Early repayment of senior notes							$ 71,000,000
Debt premium														$ 1,000,000
Unsecured Debt
Debt Instrument [Line Items]
Notes and debentures before unamortized discount and debt issuance costs											$ 1,000,000,000.0
Unsecured Debt \| 7.75% notes due in 2029
Debt Instrument [Line Items]
Debt interest rate								7.75%
Unsecured Debt \| 4.375% notes due 2028
Debt Instrument [Line Items]
Debt tender offer, maximum aggregate purchase price					$ 1,000,000,000.0
Debt interest rate					4.375%			4.375%
Unsecured Debt \| 4.250% Notes Due January 15, 2030
Debt Instrument [Line Items]
Debt interest rate											4.25%
Notes and debentures before unamortized discount and debt issuance costs											$ 600,000,000
Unsecured Debt \| 5.350% Notes Due July 1, 2049
Debt Instrument [Line Items]
Debt interest rate											5.35%
Notes and debentures before unamortized discount and debt issuance costs											$ 400,000,000
Line of Credit
Debt Instrument [Line Items]
Extinguishment of debt amount \| £			£ 900.0
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Extinguishment of debt amount \| £			£ 109.4
LIne of credit facility, committed amount								$ 4,000,000,000.0
Line of credit facility maximum borrowing capacity												$ 5,000,000,000.0
Letters of credit outstanding, amount								0
Debt extension term						1 year
Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
LIne of credit facility, committed amount								2,080,000,000.00
Line of credit facility maximum borrowing capacity								$ 3,000,000,000.0
Line of credit facility, commitment amount \| £													£ 112.5
Line of Credit \| $3.5B Credit Facility
Debt Instrument [Line Items]
Extinguishment of debt amount		$ 3,500,000,000
Altus Midstream LP
Debt Instrument [Line Items]
Debt leverage ratio (less than)								4.00
Altus Midstream LP \| Line of Credit
Debt Instrument [Line Items]
Debt covenant leverage ratio								5.00
Incentive distribution								$ 30,000,000
Adjusted pursuant agreement consecutive equals or exceeds								$ 350,000,000.0
Altus Midstream LP \| Line of Credit \| Minimum
Debt Instrument [Line Items]
Debt covenant leverage ratio								4.00
Altus Midstream LP \| Line of Credit \| Maximum
Debt Instrument [Line Items]
Debt covenant leverage ratio								5.50
Altus Midstream LP \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit outstanding								$ 396,000,000
Line of credit facility maximum borrowing capacity				$ 800,000,000
Line of credit facility, maximum borrowing capacity, if adding new lenders				$ 1,500,000,000
Letters of credit outstanding, amount								$ 0	$ 0
Line of credit facility, number of extension options \| contract				2
Debt extension term				1 year
Altus Midstream LP \| Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity				$ 100,000,000
Altus Midstream LP \| Line of Credit \| Swingline Loan Subfacility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity				$ 100,000,000