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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586

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Balance Type:	credit
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt 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
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Balance Type:	na
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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

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

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Details

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- Details

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Debt - Conversion (Details) - USD ($) $ in Millions	12 Months Ended
Debt - Conversion (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2018
Debt Instrument [Line Items]
Debt repurchased amount		$ 160
Senior notes
Debt Instrument [Line Items]
Debt repurchased amount		$ 160
Senior notes \| 6.625% senior notes due 2020
Debt Instrument [Line Items]
Interest rate, stated percentage		6.625%
Notes	$ 229
Debt repurchased amount		$ 32
Senior notes \| 6.875% senior notes due 2020
Debt Instrument [Line Items]
Interest rate, stated percentage		6.875%
Notes	134
Debt repurchased amount		$ 20
Senior notes \| 4.875% senior notes due 2022
Debt Instrument [Line Items]
Interest rate, stated percentage		4.875%
Debt repurchased amount		$ 66
Senior notes \| 5.75% senior notes due 2023
Debt Instrument [Line Items]
Interest rate, stated percentage		5.75%
Debt repurchased amount		$ 42
Senior notes \| 7.00% senior notes due 2024
Debt Instrument [Line Items]
Interest rate, stated percentage		7.00%	7.00%
Notes	226
Senior notes \| 8.00% senior notes due 2025
Debt Instrument [Line Items]
Notes	999
Senior notes \| 8.00% senior notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage		8.00%
Notes	873
Senior notes \| 7.5% senior notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage		7.50%	7.50%
Notes	281
Senior notes \| 8.00% senior notes due 2027
Debt Instrument [Line Items]
Interest rate, stated percentage		8.00%
Notes	837
Senior notes \| 6.125% senior notes due 2021
Debt Instrument [Line Items]
Interest rate, stated percentage		6.125%
Notes	381
Senior notes \| 5.375% senior notes due 2021
Debt Instrument [Line Items]
Interest rate, stated percentage		5.375%
Notes	140
Senior notes \| 7.00% Senior Notes Due 2024, 8.00% Senior Notes Due 2025, 8.00% Senior Notes Due 2026, 7.5% Senior Notes Due 2026, and 8.00% Senior Notes Due 2027
Debt Instrument [Line Items]
Notes	3,216
Senior notes \| 6.625% Senior Notes Due 2020, 6.875% Senior Notes Due 2020, 6.125% Senior Notes Due 2021, And 5.375% Senior Notes Due 2021
Debt Instrument [Line Items]
Notes	$ 884