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Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information    
Operating revenues $ 2,019 $ 2,165
Depreciation and amortization 109 85
Reorganization costs 3 13
Gain on sale of assets 6 1
Equity in losses of unconsolidated affiliates (11) (21)
Income/(loss) from continuing operations before income taxes 144 98
Income/(loss) from continuing operations 121 94
Income from discontinued operations, net of tax 0 388
Net (loss)/income 121 482
Eliminations    
Segment Reporting Information    
Operating revenues (3) (2)
Depreciation and amortization 0 0
Reorganization costs 0 0
Gain on sale of assets 0 0
Equity in losses of unconsolidated affiliates 0 0
Income/(loss) from continuing operations before income taxes (1) (1)
Income/(loss) from continuing operations   (1)
Income from discontinued operations, net of tax   0
Net (loss)/income (1) (1)
Texas | Operating Segments    
Segment Reporting Information    
Operating revenues 1,358 1,466
Depreciation and amortization 59 40
Reorganization costs 1 1
Gain on sale of assets 0 0
Equity in losses of unconsolidated affiliates 0 (3)
Income/(loss) from continuing operations before income taxes 162 150
Income/(loss) from continuing operations   150
Income from discontinued operations, net of tax   0
Net (loss)/income 162 150
East | Operating Segments    
Segment Reporting Information    
Operating revenues 539 609
Depreciation and amortization 33 26
Reorganization costs 0 0
Gain on sale of assets 0 1
Equity in losses of unconsolidated affiliates 0 0
Income/(loss) from continuing operations before income taxes 24 99
Income/(loss) from continuing operations   99
Income from discontinued operations, net of tax   0
Net (loss)/income 24 99
West/Other | Operating Segments    
Segment Reporting Information    
Operating revenues 125 93
Depreciation and amortization 8 11
Reorganization costs 0 0
Gain on sale of assets 1 0
Equity in losses of unconsolidated affiliates (11) (18)
Income/(loss) from continuing operations before income taxes 41 (23)
Income/(loss) from continuing operations   (23)
Income from discontinued operations, net of tax   0
Net (loss)/income 41 (23)
Corporate | Operating Segments    
Segment Reporting Information    
Operating revenues 0 (1)
Depreciation and amortization 9 8
Reorganization costs 2 12
Gain on sale of assets 5 0
Equity in losses of unconsolidated affiliates 0 0
Income/(loss) from continuing operations before income taxes (82) (127)
Income/(loss) from continuing operations   (131)
Income from discontinued operations, net of tax   388
Net (loss)/income $ (105) $ 257