The percentage reduction to the calculated variable rate.

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Represents the percentage of principal amount at which the holder of the note may require the entity to repurchase the debt instrument.

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The securities amount held as a percent.

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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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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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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

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The average effective interest rate during the reporting period.

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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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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For a debtor, the aggregate gain (loss) recognized on the restructuring of payables arises from the difference between the book value of the debt before the restructuring and the fair value of the payments on the debt after restructuring is complete.

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

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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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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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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.

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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 additional borrowings, net of cash paid to third parties in connection with debt origination.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Provide the per share amount of gain (loss), after the impact of income taxes, on restructuring of payables (or debt) for all restructuring gains (losses) (in aggregate) during the period.

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Debt (Issued) (Details) $ / shares in Units, $ in Millions						1 Months Ended	3 Months Ended		9 Months Ended
Debt (Issued) (Details) $ / shares in Units, $ in Millions	Sep. 11, 2020 USD ($)	Aug. 14, 2020 USD ($) $ / shares	Jan. 17, 2020 USD ($)	May 24, 2019 USD ($)	Feb. 01, 2019 USD ($)	Jun. 30, 2018	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt
Proceeds from issuance of debt									$ 743	$ 1,056
New debt issued in exchange									925
Aggregate net gain (loss)							$ 449	$ (12)	396	$ (39)
Equity component of convertible debt instruments							46		46
Aggregate principal amount outstanding							8,011		8,011		$ 9,361
Exchanged
Debt
New debt issued in exchange									925
Original debt in exchange	$ 1,510
Gains (losses) on restructuring							428		$ 428
Five-Year Revolving Credit Facility
Debt
Borrowing capacity, maximum											1,300
Commitment fee percentage at period end									0.875%
Credit facility amount outstanding							0		$ 0
Letters of credit issued and outstanding							30		30
Credit facility available borrowing capacity							$ 1,300		$ 1,300
Five-Year Revolving Credit Facility \| Minimum
Debt
Commitment fee percentage at period end						0.375%
Five-Year Revolving Credit Facility \| Maximum
Debt
Commitment fee percentage at period end						1.00%
Five-Year Revolving Credit Facility \| Adjusted LIBOR
Debt
Spread on variable rate basis (as a percent)									3.375%
Percentage reduction to the calculated variable rate						1.00%
Five-Year Revolving Credit Facility \| Adjusted LIBOR \| Minimum
Debt
Spread on variable rate basis (as a percent)						2.625%
Five-Year Revolving Credit Facility \| Adjusted LIBOR \| Maximum
Debt
Spread on variable rate basis (as a percent)						3.375%
6.375% Senior Notes due December 2021
Debt
Debt instrument interest rate stated percentage							6.375%		6.375%
Interest rate, as adjusted (as a percent)									8.375%
Aggregate principal amount outstanding							$ 116		$ 116		222
3.80% Senior Notes due October 2022
Debt
Debt instrument interest rate stated percentage							3.80%		3.80%
Interest rate, as adjusted (as a percent)									5.80%
Aggregate principal amount outstanding							$ 37		$ 37		190
7.35% Senior Notes due December 2041
Debt
Debt instrument interest rate stated percentage							7.35%		7.35%
Interest rate, as adjusted (as a percent)									9.35%
Aggregate principal amount outstanding							$ 177		$ 177		300
0.50% Exchangeable Senior Bonds due January 2023
Debt
Debt instrument interest rate stated percentage							0.50%		0.50%
Original debt in exchange		$ 397
Debt conversion ratio									0.09729756
Debt conversion (in dollars per share) \| $ / shares							$ 10.28		$ 10.28
Aggregate principal amount outstanding							$ 463		$ 463		863
8.00% Senior Notes due February 2027
Debt
Debt instrument interest rate stated percentage			8.00%				8.00%		8.00%
Debt instrument face value			$ 750
Proceeds from issuance of debt			$ 743
Redemption price of debt instrument (as a percent)			100.00%
Aggregate principal amount outstanding							$ 612		$ 612
2.50% Senior Guaranteed Exchangeable Bonds due January 2027
Debt
Debt instrument interest rate stated percentage							2.50%		2.50%
Redemption price of debt instrument (as a percent)		100.00%
New debt issued in exchange		$ 238
Gains (losses) on restructuring									$ 72
Gains (losses) on restructuring (in dollars per share) \| $ / shares							$ 0.12		$ 0.12
Debt conversion ratio		0.162163
Debt conversion (in dollars per share) \| $ / shares		$ 6.17
Equity component of convertible debt instruments									$ 46
Aggregate principal amount outstanding							$ 238		238
2.50% Senior Guaranteed Exchangeable Bonds due January 2027 \| Perestroika AS
Debt
New debt issued in exchange									213
Original debt in exchange									$ 356
Securities held (as a percent)							10.00%		10.00%
11.50% Senior Guaranteed Notes due January 2027
Debt
Debt instrument interest rate stated percentage	11.50%						11.50%		11.50%
New debt issued in exchange	$ 687
Gains (losses) on restructuring							$ 356		$ 356
Gains (losses) on restructuring (in dollars per share) \| $ / shares							$ 0.58		$ 0.58
Maximum percent of original aggregate principal	40.00%
Aggregate principal amount outstanding							$ 687		$ 687
11.50% Senior Guaranteed Notes due January 2027 \| Use of cash
Debt
Redemption price of debt instrument (as a percent)	100.00%
11.50% Senior Guaranteed Notes due January 2027 \| Use of cash from equity offering
Debt
Redemption price of debt instrument (as a percent)	111.50%
6.875% Senior Secured Notes due February 2027
Debt
Debt instrument interest rate stated percentage					6.875%		6.875%		6.875%
Debt instrument face value					$ 550
Proceeds from issuance of debt					539
Aggregate principal amount outstanding							$ 550		$ 550		550
Restricted cash and cash equivalents					$ 19
5.375% Senior Secured Notes due May 2023
Debt
Debt instrument interest rate stated percentage				5.375%			5.375%		5.375%
Debt instrument face value				$ 525
Proceeds from issuance of debt				517
Aggregate principal amount outstanding							$ 504		$ 504		$ 525
Restricted cash and cash equivalents				$ 14