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Unaudited Quarterly Financial Information (Notes)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Financial Information
Unaudited Quarterly Financial Information
(In Thousands, Except Per Share Data)
Quarter Ended
Mar 31
 
Jun 30
 
Sep 30
 
Dec 31
2018
 
 
 
 
 
 
 
Operating Revenues and Other
$
3,681,162

 
$
4,238,077

 
$
4,781,624

 
$
4,574,536

Operating Income
$
874,588

 
$
964,931

 
$
1,506,687

 
$
1,123,140

Income Before Income Taxes
$
813,359

 
$
892,936

 
$
1,446,363

 
$
1,088,340

Income Tax Provision
174,770

 
196,205

 
255,411

 
195,572

Net Income
$
638,589

 
$
696,731

 
$
1,190,952

 
$
892,768

Net Income Per Share (1)
 

 
 

 
 

 
 

Basic
$
1.11

 
$
1.21

 
$
2.06

 
$
1.55

Diluted
$
1.10

 
$
1.20

 
$
2.05

 
$
1.54

Average Number of Common Shares
 

 
 

 
 

 
 

Basic
575,775

 
576,135

 
577,254

 
577,035

Diluted
579,726

 
580,375

 
581,559

 
580,288

2017
 

 
 

 
 

 
 

Operating Revenues and Other
$
2,610,565

 
$
2,612,472

 
$
2,644,844

 
$
3,340,439

Operating Income
$
107,746

 
$
127,908

 
$
214,836

 
$
475,912

Income Before Income Taxes
$
39,382

 
$
62,467

 
$
145,980

 
$
413,353

Income Tax Provision (Benefit) (2)
10,865

 
39,414

 
45,439

 
(2,017,115
)
Net Income
$
28,517

 
$
23,053

 
$
100,541

 
$
2,430,468

Net Income Per Share (1)
 

 
 

 
 

 
 

Basic
$
0.05

 
$
0.04

 
$
0.17

 
$
4.22

Diluted
$
0.05

 
$
0.04

 
$
0.17

 
$
4.20

Average Number of Common Shares
 

 
 

 
 

 
 

Basic
573,935

 
574,439

 
574,783

 
575,394

Diluted
578,593

 
578,483

 
578,736

 
579,203

 
(1)
The sum of quarterly net income per share may not agree with total year net income per share as each quarterly computation is based on the weighted average of common shares outstanding.
(2)
Includes an income tax benefit of approximately $2.2 billion for the quarter ended December 31, 2017, primarily due to the enactment of the Tax Cuts and Jobs Act in December 2017. See Note 6 to the Consolidated Financial Statements.