Restructuring And Other Charges	12 Months Ended
	Dec. 31, 2021
Restructuring And Other Charges [Abstract]
Restructuring And Other Charges	(11) Restructuring and Other Charges: Restructuring and other charges consists of severance and employee costs related to workforce reductions. It also includes professional fees related to our Chapter 11 Cases that were incurred after the emergence date as well as professional fees related to our restructuring and transformation that were incurred prior to the Petition Date. During the four months ended April 30, 2021, we incurred $7 million of severance and employee costs resulting from workforce reductions. During the eight months ended December 31, 2021, we incurred $21 million in expenses consisting of $11 million of severance and employee costs resulting from workforce reductions, and $10 million of professional fees related to our balance sheet and other restructuring. During 2020, we incurred $87 million in expenses consisting of $8 million directly associated with transformation initiatives, $7 million of severance and employee costs resulting from workforce reductions, and $72 million of consulting and advisory costs related to our balance sheet restructuring activities through the Petition Date.Effective with the Petition date, these other charges consisting of consulting and advisory costs incurred were recorded in Reorganization items, net in the consolidated statement of operations. During 2019, we incurred $168 million in expenses related to changes in the operation of our business, consisting of $46 million directly associated with transformation initiatives, $44 million of pension/OPEB special termination benefit enhancements related to a voluntary severance program, $38 million of severance and employee costs resulting from workforce reductions, and $40 million of consulting and advisory costs related to our balance sheet restructuring activities, which are included in “Restructuring costs and other charges” in our consolidated statement of operations for the year ended December 31, 2019. The following is a summary of the changes in the liabilities established for restructuring and related programs: ($ in millions) Balance at December 31, 2019 (Predecessor) $15 Severance expense 7 Transformation costs 8 Other costs 72 Cash payments during the period (100) Balance at December 31, 2020 (Predecessor) 2 Severance expense 7 Cash payments during the period (2) Balance at April 30, 2021 (Predecessor) $7 Balance at April 30, 2021 (Successor) $7 Severance expense 11 Other costs 10 Cash payments during the period (21) Balance at December 31, 2021 (Successor) $7