Maximum term of capital lease period in Years

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Minimum Term of Capital Leases for repayment based on expiration date of original lease contract

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Number of days prior to the maturity date at which the maximum debt threshold must be met in order to not accelerate the debt.

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The effective basis spread used to determine the effective interest rate.

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Defined Benefit Plan, Lease term of contributed property

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Gain (loss) on contribution of property to defined benefit

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Maximum debt threshold amount that much be reached in order to not accelerated the debt maturity.

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Pension Building Contribution Aggregate Annual Rent

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Value of property contributed in noncash investing and financing activities.

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

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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.

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

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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

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Description of a subjective acceleration clause that is a part of the debt instrument. A subjective acceleration clause is a provision in a debt agreement that states that the creditor may accelerate the scheduled maturities of the obligation under conditions that are not objectively determinable (for example, if the debtor fails to maintain satisfactory operations or if a material adverse change occurs).

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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to 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 cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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The cash outflow from a repayment of a borrowing having initial term of repayment of more than three months. Includes repayments of short-term and long-term debt.

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The liability due as of the balance sheet date for leasebacks accounted for using the deposit method.

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Long-Term Debt (Narrative) (Details) - USD ($)				12 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Mar. 15, 2019	Oct. 01, 2018	Jul. 03, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jul. 03, 2018	Mar. 19, 2018	Jun. 15, 2017
Debt Instrument [Line Items]
Line of credit facility, current borrowings				$ 749,000,000
Payment to retire debt instruments				2,483,000,000
Loss on early extinguishment of debt				$ (20,000,000)	$ 32,000,000	$ (88,000,000)
Gain on extinguishment of debt					32,000,000
Financing obligation for contributions of real property to pension plan					37,000,000
Pension Building Contribution Aggregate Annual Rent					5,000,000
Lease term of contributed property				20 years
Gain (loss) on contribution of property to defined benefit							$ 0
Capital Lease Term, minimum years				1 year
Capital Lease Term, maximum years				7 years
Proceeds from long-term debt borrowings				$ 1,650,000,000	1,840,000,000	$ 1,500,000,000
Remaining outstanding principal				17,516,000,000	17,400,000,000
Sale leaseback transaction				37,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, current borrowings				$ 101,000,000
Term Loan Due 06/15/2024 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date				Jun. 15, 2024
Proceeds from long-term debt borrowings			$ 240,000,000		240,000,000
Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Payments to retire debt					117,000,000
Senior Unsecured Debt [Member] \| Senior Note Due 7/1/2021 [Member]
Debt Instrument [Line Items]
Interest rate						9.25%
Debt instrument, maturity date						Jul. 01, 2021
Payments to retire debt						$ 10,000,000
Senior Unsecured Debt [Member] \| Senior Note Due 10/1/2018 [Member]
Debt Instrument [Line Items]
Interest rate						8.125%
Debt instrument, maturity date				Oct. 01, 2018
Payments to retire debt						$ 92,000,000
Senior Unsecured Debt [Member] \| Senior Note Due 4/15/2020 [Member]
Debt Instrument [Line Items]
Interest rate						8.50%
Debt instrument, maturity date				Apr. 15, 2020
Payments to retire debt						$ 550,000,000
Senior Unsecured Debt [Member] \| Senior Note Due 9/15/2020 [Member]
Debt Instrument [Line Items]
Interest rate						8.875%
Debt instrument, maturity date				Sep. 15, 2020
Payments to retire debt						$ 763,000,000
Senior Unsecured Debt [Member] \| Senior Note Due 3/15/2019 [Member]
Debt Instrument [Line Items]
Interest rate				7.125%		7.125%
Debt instrument, maturity date				Mar. 15, 2019
Payments to retire debt						$ 30,000,000
Payment to retire debt instruments				$ 348,000,000
Senior Unsecured Debt [Member] \| Senior Note Due 4/15/2017 [Member]
Debt Instrument [Line Items]
Interest rate						8.25%
Payments to retire debt						$ 210,000,000
Senior Unsecured Debt [Member] \| Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Remaining outstanding principal				227,000,000
Senior Unsecured Debt [Member] \| Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Remaining outstanding principal				309,000,000
Secured Debt [Member]
Debt Instrument [Line Items]
Payment to retire debt instruments					828,000,000
Remaining outstanding principal				$ 5,711,000,000	5,246,000,000
Secured Debt [Member] \| Second Lien Notes Due 4/1/2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount					$ 1,600,000,000				$ 1,600,000,000
Interest rate				8.50%	8.50%				8.50%
Debt instrument, maturity date				Apr. 01, 2026
Remaining outstanding principal				$ 1,600,000,000	$ 1,600,000,000
Secured Debt [Member] \| Term Loan Due 06/15/2024 [Member]
Debt Instrument [Line Items]
Interest rate				5.55%	6.28%
Debt instrument, maturity date				Jun. 15, 2024
Remaining outstanding principal				$ 1,699,000,000	$ 1,716,000,000
Secured Debt [Member] \| First Lien Notes Due 4/1/2027 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,650,000,000
Interest rate	8.00%			8.00%
Debt instrument, maturity date				Apr. 01, 2027
Remaining outstanding principal				$ 1,650,000,000
Secured Debt [Member] \| Revolver Due 2/27/2024 [Member]
Debt Instrument [Line Items]
Interest rate				4.76%	5.28%
Debt instrument, maturity date				Feb. 27, 2024
Remaining outstanding principal				$ 749,000,000	$ 275,000,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Remaining outstanding principal				$ 10,949,000,000	$ 11,297,000,000
Unsecured Debt [Member] \| Senior Note Due 7/1/2021 [Member]
Debt Instrument [Line Items]
Interest rate				9.25%	9.25%
Debt instrument, maturity date				Jul. 01, 2021	Jul. 01, 2021
Payment to retire debt instruments					$ 400,000,000
Remaining outstanding principal				$ 89,000,000	$ 89,000,000
Unsecured Debt [Member] \| Senior Note Due 9/15/2021 [Member]
Debt Instrument [Line Items]
Interest rate				6.25%	6.25%
Debt instrument, maturity date				Sep. 15, 2021	Sep. 15, 2021
Payment to retire debt instruments					$ 555,000,000
Remaining outstanding principal				$ 220,000,000	$ 220,000,000
Unsecured Debt [Member] \| Senior Note Due 4/15/2022 [Member]
Debt Instrument [Line Items]
Interest rate				8.75%	8.75%
Debt instrument, maturity date				Apr. 15, 2022
Remaining outstanding principal				$ 500,000,000	$ 500,000,000
Unsecured Debt [Member] \| Senior Note Due 9/15/2022 [Member]
Debt Instrument [Line Items]
Interest rate				10.50%	10.50%
Debt instrument, maturity date				Sep. 15, 2022
Remaining outstanding principal				$ 2,188,000,000	$ 2,188,000,000
Unsecured Debt [Member] \| Senior Note Due 1/15/2023 [Member]
Debt Instrument [Line Items]
Interest rate				7.125%	7.125%
Debt instrument, maturity date				Jan. 15, 2023
Remaining outstanding principal				$ 850,000,000	$ 850,000,000
Unsecured Debt [Member] \| Senior Note Due 4/15/2024 [Member]
Debt Instrument [Line Items]
Interest rate				7.625%	7.625%
Debt instrument, maturity date				Apr. 15, 2024
Remaining outstanding principal				$ 750,000,000	$ 750,000,000
Unsecured Debt [Member] \| Senior Note Due 1/15/2025 [Member]
Debt Instrument [Line Items]
Interest rate				6.875%	6.875%
Debt instrument, maturity date				Jan. 15, 2025
Remaining outstanding principal				$ 775,000,000	$ 775,000,000
Unsecured Debt [Member] \| Debentures Due 11/1/2025 [Member]
Debt Instrument [Line Items]
Interest rate				7.00%	7.00%
Debt instrument, maturity date				Nov. 01, 2025
Remaining outstanding principal				$ 138,000,000	$ 138,000,000
Unsecured Debt [Member] \| Senior Note Due 8/15/2031 [Member]
Debt Instrument [Line Items]
Interest rate				9.00%	9.00%
Debt instrument, maturity date				Aug. 15, 2031
Remaining outstanding principal				$ 945,000,000	$ 945,000,000
Unsecured Debt [Member] \| Debentures Due 10/1/2034 [Member]
Debt Instrument [Line Items]
Interest rate				7.68%	7.68%
Debt instrument, maturity date				Oct. 01, 2034
Remaining outstanding principal				$ 1,000,000	$ 1,000,000
Unsecured Debt [Member] \| Senior Notes Due 10/1/2018 [Member]
Debt Instrument [Line Items]
Interest rate					8.125%
Debt instrument, maturity date				Oct. 01, 2018
Payments to retire debt					$ 61,000,000
Payment to retire debt instruments		$ 431,000,000
Unsecured Debt [Member] \| Senior Note Due 4/15/2020 [Member]
Debt Instrument [Line Items]
Interest rate				8.50%	8.50%
Debt instrument, maturity date				Apr. 15, 2020
Payment to retire debt instruments					$ 447,000,000
Remaining outstanding principal				$ 172,000,000	$ 172,000,000
Unsecured Debt [Member] \| Senior Note Due 9/15/2020 [Member]
Debt Instrument [Line Items]
Interest rate				8.875%	8.875%
Debt instrument, maturity date				Sep. 15, 2020	Sep. 15, 2020
Payment to retire debt instruments					$ 249,000,000
Remaining outstanding principal				$ 55,000,000	$ 55,000,000
Unsecured Debt [Member] \| Senior Note Due 3/15/2019 [Member]
Debt Instrument [Line Items]
Interest rate					7.125%
Debt instrument, maturity date				Mar. 15, 2019	Mar. 15, 2019
Payments to retire debt					$ 56,000,000
Remaining outstanding principal					348,000,000
Unsecured Debt Excluding Open Market Purchases [Member]
Debt Instrument [Line Items]
Payment to retire debt instruments					$ 1,651,000,000
JP Morgan Term Loan A [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 1,625,000,000
JP Morgan Term Loan A [Member] \| Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date				Mar. 31, 2021
JP Morgan Term Loan B [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 1,740,000,000						$ 1,500,000,000
Debt instrument, maturity date				Jun. 15, 2024
JP Morgan Revolving Credit Facility 2015 [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date				Feb. 27, 2024
Line of credit facility maximum borrowing capacity				$ 850,000,000
JP Morgan Revolving Credit Facility 2015 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Effective basis spread				3.00%
JP Morgan Revolving Credit Facility 2015 [Member] \| Revolver Due 2/27/2024 [Member]
Debt Instrument [Line Items]
Increased interest rate	0.25%
JP Morgan Revolving Credit Facility 2015 [Member] \| Senior Notes Maturing In 2020, 2023 And 2024 [Member]
Debt Instrument [Line Items]
Days Prior To Maturity To Meet Threshold To Not Accelerate Debt				91 days
Maximum Debt Threshold To Not Accelerate Debt				$ 500,000,000
JP Morgan Revolving Credit Facility 2015 [Member] \| Senior Notes Maturing In 2021 Or 2022 [Member]
Debt Instrument [Line Items]
Days Prior To Maturity To Meet Threshold To Not Accelerate Debt				91 days
Maximum Debt Threshold To Not Accelerate Debt				$ 500,000,000
JP Morgan Revolving Credit Facility 2015 [Member] \| Senior Unsecured Debt [Member] \| Senior Notes Maturing In 2020, 2023 And 2024 [Member]
Debt Instrument [Line Items]
Maximum Debt Threshold To Not Accelerate Debt	$ 500,000,000
JP Morgan Revolving Credit Facility 2015 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date				Feb. 27, 2024	Feb. 27, 2022
JP Morgan Term Loan B And Revolver [Member] \| Revolver Due 2/27/2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Acceleration Cause				The maturities of the Term Loan B and the Revolver, in each case if still outstanding, will be accelerated in the following circumstances: (i) if, 91 days before the maturity date of any series of Senior Notes maturing in 2020, 2023 and 2024, more than $500 million in principal amount remains outstanding on such series; or (ii) if, 91 days before the maturity date of the first series of Senior Notes maturing in 2021 or 2022, more than $500 million in principal amount remains outstanding, in the aggregate, on the two series of Senior Notes maturing in such year.
Letter Of Credit, July 2019 [Member]
Debt Instrument [Line Items]
Line of credit facility, current borrowings				$ 20,000,000
CoBank Term Loan 2016 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount								$ 315,000,000
Debt instrument, maturity date				Oct. 12, 2021
CoBank Term Loan 2014 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount								$ 350,000,000
JP Morgan Term Loan B [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate margin				2.75%
JP Morgan Term Loan B [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin				3.75%
Minimum [Member] \| JP Morgan Term Loan B And Revolver [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate margin				1.00%
Minimum [Member] \| JP Morgan Term Loan B And Revolver [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin				2.00%
Maximum [Member] \| JP Morgan Term Loan B And Revolver [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate margin				2.00%
Maximum [Member] \| JP Morgan Term Loan B And Revolver [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin				3.00%