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Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summary of Unaudited Quarterly Financial Data
Summarized unaudited quarterly financial data is as follows:
 
Quarter Ended
 
2018
 
December 31
 
September 30
 
June 30
 
March 31
 
(In millions, except per share data)
Operating revenues
$
1,992

 
$
2,960

 
$
2,461

 
$
2,065

Operating income
49

 
398

 
174

 
361

Net (loss)/income from continuing operations
(93
)
 
288

 
27

 
238

Income/(loss) from discontinued operations
80

 
(336
)
 
69

 
(5
)
Net (loss)/income
(13
)
 
(48
)
 
96

 
233

Less: Net (loss)/income attributable to noncontrolling interests and redeemable noncontrolling interests
(2
)
 
24

 
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

 
Quarter Ended
 
2017
 
December 31
 
September 30
 
June 30
 
March 31
 
(In millions, except per share data)
Operating revenues
$
2,154

 
$
2,618

 
$
2,281

 
$
2,021

Operating (loss)/income
(1,200
)
 
275

 
214

 
(30
)
Net (loss)/income from continuing operations
(1,390
)
 
163

 
60

 
(178
)
(Loss)/income from discontinued operations
(265
)
 
—

 
(702
)
 
(25
)
Net (loss)/income
(1,655
)
 
163

 
(642
)
 
(203
)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests
(120
)
 
(8
)
 
(16
)
 
(40
)
(Loss)/income available to Common Stockholders
$
(1,535
)
 
$
171

 
$
(626
)
 
$
(163
)
Weighted average number of common shares outstanding — basic
317

 
317

 
316

 
316

(Loss)/income from discontinued operations per weighted average common share — basic
$
(0.84
)
 
$
—

 
$
(2.22
)
 
$
(0.08
)
Net (loss)/income per weighted average common share — basic
$
(4.84
)
 
$
0.54

 
$
(1.98
)
 
$
(0.52
)
Weighted average number of common shares outstanding — diluted
317

 
322

 
316

 
316

(Loss)/income from discontinued operations per weighted average common share — diluted
$
(0.84
)
 
$
—

 
$
(2.22
)
 
$
(0.08
)
Net (loss)/income per weighted average common share — diluted
$
(4.84
)
 
$
0.53

 
$
(1.98
)
 
$
(0.52
)