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Statements of Condensed Consolidated Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests in Consolidated Subsidiaries
Beginning Balance (in shares) at Dec. 31, 2016   172,827      
Beginning Balance at Dec. 31, 2016 $ 9,119,247 $ 3,349,166 $ 2,509,073 $ 2,042 $ 3,258,966
Comprehensive income (net of tax):          
Net income (loss) 478,807   228,458   250,349
Net change in cash flow hedges:          
Natural gas, net of tax benefit (4,011)     (4,011)  
Interest rate, net of tax expense 108     108  
Other post-retirement benefit liability adjustment, net of tax expense 230     230  
Dividends (15,620)   (15,620)    
Stock-based compensation plans, net (in shares)   516      
Stock-based compensation plans, net 18,414 $ 18,224     190
Distributions to noncontrolling interests (172,498)       (172,498)
Ending Balance (in shares) at Sep. 30, 2017   173,343      
Ending Balance at Sep. 30, 2017 9,424,677 $ 3,367,390 2,721,911 (1,631) 3,337,007
Comprehensive income (net of tax):          
Net income (loss) 105,457        
Net change in cash flow hedges:          
Natural gas, net of tax benefit (1,451)        
Other post-retirement benefit liability adjustment, net of tax expense 77        
Ending Balance (in shares) at Sep. 30, 2017   173,343      
Ending Balance at Sep. 30, 2017 9,424,677 $ 3,367,390 2,721,911 (1,631) 3,337,007
Net change in cash flow hedges:          
Change in accounting principle [1] 4,113   4,113    
Beginning Balance (in shares) at Dec. 31, 2017   264,320      
Beginning Balance at Dec. 31, 2017 18,414,613 $ 9,325,301 3,996,775 (2,458) 5,094,995
Comprehensive income (net of tax):          
Net income (loss) (1,245,185)   (1,607,881)   362,696
Net change in cash flow hedges:          
Natural gas, net of tax benefit (1,183)     (1,183)  
Interest rate, net of tax expense 132     132  
Other post-retirement benefit liability adjustment, net of tax expense 258     258  
Dividends (23,736)   (23,736)    
Stock-based compensation plans, net (in shares)   752      
Stock-based compensation plans, net 5,425 $ 4,472     953
Distributions to noncontrolling interests (279,539)       (279,539)
Repurchase and retirement of common stock (in shares)   (10,646)      
Repurchase and retirement of common stock (538,876) $ (538,876)      
Purchase of Strike Force Midstream LLC noncontrolling interests (175,000) 1,818     (176,818)
Change in ownership of consolidated subsidiaries 56,370 $ (158,560)     214,930
Ending Balance (in shares) at Sep. 30, 2018   254,426      
Ending Balance at Sep. 30, 2018 16,217,392 $ 8,634,155 2,369,271 (3,251) 5,217,217
Comprehensive income (net of tax):          
Net income (loss) 63,448        
Net change in cash flow hedges:          
Natural gas, net of tax benefit (430)        
Other post-retirement benefit liability adjustment, net of tax expense 86        
Ending Balance (in shares) at Sep. 30, 2018   254,426      
Ending Balance at Sep. 30, 2018 $ 16,217,392 $ 8,634,155 $ 2,369,271 $ (3,251) $ 5,217,217
[1] Related to adoption of ASU No. 2016-01. See Notes K and S for additional information.