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Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Segment Reporting Information          
Operating revenues $ 6,609 $ 2,809 $ 19,943 $ 7,066  
Depreciation and amortization 199 99 569 318  
Impairment losses 0 29 306 29  
Gain on sale of assets     17 6  
Equity in earnings of unconsolidated affiliates 15 36 23 37  
Income/(loss) before income taxes 2,163 341 3,454 899  
Net income/(loss) 1,618 249 2,614 683  
Total assets 27,965   27,965   $ 14,902
Corporate          
Segment Reporting Information          
Operating revenues 0 0 0 0  
Depreciation and amortization 7 7 21 26  
Impairment losses   0 0 0  
Gain on sale of assets     0 5  
Equity in earnings of unconsolidated affiliates 0 0 0 0  
Income/(loss) before income taxes (208) (115) (536) (306)  
Net income/(loss) (739) (206) (1,344) (520)  
Total assets 10,507   10,507    
Eliminations          
Segment Reporting Information          
Operating revenues 13 2 15 (1)  
Depreciation and amortization 0 0 0 0  
Impairment losses   0 0 0  
Gain on sale of assets     0 0  
Equity in earnings of unconsolidated affiliates 0 0 0 0  
Income/(loss) before income taxes 0 0 0 0  
Net income/(loss) 0 0 0 0  
Total assets (17,066)   (17,066)    
Texas | Operating Segments          
Segment Reporting Information          
Operating revenues 2,635 1,992 8,362 4,928  
Depreciation and amortization 84 49 245 167  
Impairment losses   0 0 0  
Gain on sale of assets     0 0  
Equity in earnings of unconsolidated affiliates (2) 0 (3) (3)  
Income/(loss) before income taxes 251 287 600 799  
Net income/(loss) 251 287 600 799  
Total assets 9,929   9,929    
East | Operating Segments          
Segment Reporting Information          
Operating revenues 3,077 666 9,002 1,732  
Depreciation and amortization 88 33 238 97  
Impairment losses   0 306 0  
Gain on sale of assets     0 0  
Equity in earnings of unconsolidated affiliates 0 0 0 0  
Income/(loss) before income taxes 1,989 146 3,136 308  
Net income/(loss) 1,976 145 3,107 307  
Total assets 19,940   19,940    
West/Services/Other | Operating Segments          
Segment Reporting Information          
Operating revenues 884 149 2,564 407  
Depreciation and amortization 20 10 65 28  
Impairment losses   29 0 29  
Gain on sale of assets     17 1  
Equity in earnings of unconsolidated affiliates 17 36 26 40  
Income/(loss) before income taxes 131 23 254 98  
Net income/(loss) 130 $ 23 251 $ 97  
Total assets $ 4,655   $ 4,655