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Financing Arrangements and Derivative Financial Instruments - Notes Narrative (Details) - USD ($) $ in Millions		9 Months Ended
	Aug. 17, 2020	Sep. 30, 2020	Sep. 30, 2019	Aug. 16, 2020	May 22, 2020	May 18, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Notes payable		$ 3,846					$ 3,311
Long-term debt, before deferred financing fees		5,905					5,094
Repayments of long-term debt		5,149	$ 3,941
8.75% Due 2020 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, before deferred financing fees		$ 0		$ 282			$ 280
Interest rate, stated percentage		8.75%		8.75%			8.75%
Repayments of long-term debt	$ 282
9.5% due 2025 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, before deferred financing fees		$ 803					$ 0
Interest rate, stated percentage		9.50%				9.50%	9.50%
Debt instrument, principal amount		$ 800			$ 200	$ 600
Notes sold, percentage of principle amount					101.75%	100.00%
Effective yield					9.056%

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Debt Instrument, Notes Sold, Percentage of Principle Amount

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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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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