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Unaudited Quarterly Financial Data (Tables)
12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Summary of Unaudited Quarterly Financial Data Summarized unaudited quarterly financial data is as follows:
 Quarter Ended
 2019
 (In millions, except per share data)December 31September 30June 30March 31
Operating revenues$2,195  $2,996  $2,465  $2,165  
Operating income209  540  320  221  
Net income from continuing operations3,463  374  189  94  
(Loss)/income from discontinued operations(78) (2) 13  388  
Net income3,385  372  202  482  
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests —   —  
Income available to Common Stockholders$3,383  $372  $201  $482  
Weighted average number of common shares outstanding — basic
251  254  265  278  
(Loss)/income from discontinued operations per weighted average common share — basic$(0.31) $(0.01) $0.05  $1.39  
Net Income per weighted average common share — basic
$13.48  $1.46  $0.76  $1.73  
Weighted average number of common shares outstanding — diluted
253  256  267  280  
(Loss)/income from discontinued operations per weighted average common share — diluted$(0.31) $(0.01) $0.05  $1.38  
Net income per weighted average common share — diluted
$13.37  $1.45  $0.75  $1.72  
 Quarter Ended
 2018
(In millions, except per share data)December 31September 30June 30March 31
Operating revenues$1,992  $2,960  $2,461  $2,065  
Operating income49  398  174  361  
Net (loss)/income from continuing operations(93) 287  27  238  
Income/(loss) from discontinued operations80  (336) 69  (5) 
Net (loss)/income(13) (49) 96  233  
Less: Net (loss)/income attributable to noncontrolling interests and redeemable noncontrolling interests(2) 23  24  (46) 
(Loss)/income available to Common Stockholders$(11) $(72) $72  $279  
Weighted average number of common shares outstanding — basic
289  299  310  318  
Income/(loss) from discontinued operations per weighted average common share — basic$0.28  $(1.12) $0.22  $(0.02) 
Net (loss)/income per weighted average common share — basic
$(0.04) $(0.24) $0.23  $0.88  
Weighted average number of common shares outstanding — diluted
289  299  314  322  
Income/(loss) from discontinued operations per weighted average common share — diluted$0.28  $(1.12) $0.22  $(0.02) 
Net (loss)/income per weighted average common share — diluted
$(0.04) $(0.24) $0.23  $0.87