XML 66 R41.htm IDEA: XBRL DOCUMENT v3.8.0.1
Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information The following table summarizes our unaudited results of operations on a quarterly basis. The quarterly earnings per share amounts for a year will not add to the earnings per share for that year due to the weighting of shares used in calculating per share data.
 
Three Months Ended,
(in millions, except per share data)
March 31
June 30
September 30
December 31
2017
 
 
 
 
Operating revenue
$
9,148

$
10,791

$
11,060

$
10,245

Operating income
1,053

2,028

1,839

1,193

Net income
603

1,224

1,178

572

Basic earnings per share
$
0.83

$
1.68

$
1.64

$
0.81

Diluted earnings per share
$
0.82

$
1.68

$
1.64

$
0.80

2016
 
 
 
 
Operating revenue
$
9,251

$
10,447

$
10,483

$
9,458

Operating income
1,540

2,423

1,969

1,020

Net income
946

1,546

1,259

622

Basic earnings per share
$
1.22

$
2.04

$
1.70

$
0.85

Diluted earnings per share
$
1.21

$
2.03

$
1.69

$
0.84