Debt - Conversion (Details) - Senior notes - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
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
7.00% senior notes due 2024
Debt Instrument [Line Items]
Interest rate, stated percentage	7.00%	7.00%
Notes	$ 226
8.00% senior notes due 2025
Debt Instrument [Line Items]
Notes	$ 999
8.00% senior notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	8.00%
Notes	$ 873
7.5% senior notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	7.50%	7.50%
Notes	$ 281
8.00% senior notes due 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	8.00%
Notes	$ 837
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
6.625% senior notes due 2020
Debt Instrument [Line Items]
Interest rate, stated percentage	6.625%
Notes	$ 229
6.875% senior notes due 2020
Debt Instrument [Line Items]
Interest rate, stated percentage	6.875%
Notes	$ 134
6.125% senior notes due 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	6.125%
Notes	$ 381
5.375% senior notes due 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	5.375%
Notes	$ 140

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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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