Chapter 11 Filing, Going Concern and Other Related Matters Plan Support Agreement (Details) - USD ($)	Mar. 02, 2020	May 08, 2020	Dec. 31, 2019
Notes Aug 2023 [Member]
Reorganization Items [Line Items]
Interest rate, percentage			6.375%
Subsequent Event
Reorganization Items [Line Items]
Plan of Reorganization, Reduction of Funded Debt	$ 4,000,000,000
Debtor Reorganization Items, Facility Maximum Amount	3,250,000,000
Reorganization Items, Equity Rights Offering, Amount	$ 750,000,000
Reorganization Items, Backstop Premium, Percentage	8.00%
Reorganization Items, Backdrop Premium, Percentage, If Reorganization Plan Not Confirmed		4.00%
Reorganization Items, Backdrop Premium, If Reorganization Plan Not Confirmed		$ 30,000,000
Subsequent Event | Senior Lien [Member]
Reorganization Items [Line Items]
Plan of Reorganization, Participating Parties, Percentage	94.00%
Subsequent Event | Junior Lien [Member]
Reorganization Items [Line Items]
Plan of Reorganization, Participating Parties, Percentage	54.00%
Subsequent Event | Unsecured Debt
Reorganization Items [Line Items]
Plan of Reorganization, Participating Parties, Percentage	39.00%
Subsequent Event | Holders of Midwest Notes [Member]
Reorganization Items [Line Items]
Plan of Reorganization, Participating Parties, Percentage	72.00%