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Debt - Long-Term Debt (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) day $ / shares | Dec. 31, 2018 USD ($) | Feb. 01, 2019
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 8,916,000,000 | $ 8,168,000,000 |
Carrying Amount | 9,458,000,000 | 7,722,000,000 |
Debt issuance costs | (44,000,000) | (53,000,000) |
Current maturities of long-term debt, gross | (385,000,000) | (381,000,000) |
Current maturities of long-term debt, net | (385,000,000) | (381,000,000) |
Long-term debt, net | 8,531,000,000 | 7,787,000,000 |
Long-term debt, net | $ 9,073,000,000 | 7,341,000,000 |
Consecutive trading days | day | 5 |  |
Interest Rate Contract |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 0 | 0 |
Interest rate derivatives | 0 | 1,000,000 |
6.625% Senior Notes Due 2020, 4.875% Senior Notes Due 2022, and 5.75% Senior Notes Due 2023 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | 101,000,000 |  |
Revolving credit facility | Chesapeake revolving credit facility |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | 1,590,000,000 | 419,000,000 |
Revolving credit facility | 1,590,000,000 | 419,000,000 |
Term loan |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | 1,500,000,000 | 0 |
Carrying Amount | $ 1,470,000,000 | 0 |
Debt issuance costs |  | $ (13,000,000) |
Senior notes |  |  |
Long-term Debt [Abstract] |  |  |
Redemption price percentage | 35.00% | 35.00% |
Percentage of principal amount redeemed | 100.00% | 100.00% |
Senior notes | 11.5% senior secured second lien notes due 2025 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 2,330,000,000 | $ 0 |
Carrying Amount | $ 3,248,000,000 | 0 |
Interest rate, stated percentage | 11.50% |  |
Senior notes | Floating rate senior notes due 2019 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 0 | 380,000,000 |
Carrying Amount | 0 | 380,000,000 |
Senior notes | 6.625% senior notes due 2020 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | 208,000,000 | 437,000,000 |
Carrying Amount | $ 208,000,000 | 437,000,000 |
Interest rate, stated percentage | 6.625% |  |
Senior notes | 6.875% senior notes due 2020 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 93,000,000 | 227,000,000 |
Carrying Amount | $ 93,000,000 | 227,000,000 |
Interest rate, stated percentage | 6.875% |  |
Senior notes | 6.125% senior notes due 2021 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 167,000,000 | 548,000,000 |
Carrying Amount | $ 167,000,000 | 548,000,000 |
Interest rate, stated percentage | 6.125% |  |
Senior notes | 5.375% senior notes due 2021 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 127,000,000 | 267,000,000 |
Carrying Amount | $ 127,000,000 | 267,000,000 |
Interest rate, stated percentage | 5.375% |  |
Senior notes | 4.875% Senior Notes due 2022 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 338,000,000 | 451,000,000 |
Carrying Amount | $ 338,000,000 | 451,000,000 |
Interest rate, stated percentage | 4.875% |  |
Senior notes | 5.75% Senior Notes due 2023 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 209,000,000 | 338,000,000 |
Carrying Amount | $ 209,000,000 | 338,000,000 |
Interest rate, stated percentage | 5.75% |  |
Senior notes | 7.00% senior notes due 2024 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 624,000,000 | 850,000,000 |
Carrying Amount | $ 624,000,000 | $ 850,000,000 |
Interest rate, stated percentage | 7.00% | 7.00% |
Senior notes | 6.875% senior notes due 2025 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 2,000,000 | $ 0 |
Carrying Amount | $ 2,000,000 | 0 |
Interest rate, stated percentage | 6.875% |  | 6.875%
Senior notes | 8.00% senior notes due 2025 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 246,000,000 | 1,300,000,000 |
Carrying Amount | $ 245,000,000 | 1,291,000,000 |
Interest rate, stated percentage | 8.00% |  |
Senior notes | 7.5% senior notes due 2026 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 119,000,000 | 400,000,000 |
Carrying Amount | $ 119,000,000 | $ 400,000,000 |
Interest rate, stated percentage | 7.50% | 7.50% |
Senior notes | 8.00% senior notes due 2026 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 46,000,000 | $ 0 |
Carrying Amount | 44,000,000 | 0 |
Revolving credit facility | $ 919,000,000 |  |
Interest rate, stated percentage | 8.00% |  |
Senior notes | 8.00% senior notes due 2027 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 253,000,000 | 1,300,000,000 |
Carrying Amount | $ 253,000,000 | 1,299,000,000 |
Interest rate, stated percentage | 8.00% |  |
Convertible debt | 5.5% convertible senior notes due 2026 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 1,064,000,000 | 1,250,000,000 |
Carrying Amount | $ 765,000,000 | 866,000,000 |
Interest rate, stated percentage | 5.50% |  |
Interest rate, effective percentage | 11.50% |  |
Convertible debt | 5.5% convertible senior notes due 2026 | Optional Conversion by Holders |  |  |
Long-term Debt [Abstract] |  |  |
Threshold percentage of stock price trigger | 130.00% |  |
Conversion price (in usd per share) | $ / shares | $ 8.568 |  |
Percentage of principal amount redeemed | 100.00% |  |
Convertible debt | 5.5% convertible senior notes due 2026 | Optional Redemption by the Company |  |  |
Long-term Debt [Abstract] |  |  |
Threshold percentage of stock price trigger | 130.00% |  |
Redemption price percentage | 100.00% |  |
Convertible debt | 2.25% contingent convertible senior notes due 2038 |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 0 | 1,000,000 |
Carrying Amount | $ 0 | 1,000,000 |
Interest rate, stated percentage | 2.25% |  |
Interest rate, effective percentage | 8.00% |  |
Convertible debt | All convertible and all contingent convertible debt |  |  |
Long-term Debt [Abstract] |  |  |
Unamortized discount | $ 299,000,000 | $ 384,000,000 |

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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: 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=6877327&loc=d3e13212-122682 + Details
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