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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
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
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

2015
 
 
 
 
Operating revenue
$
9,388

$
10,707

$
11,107

$
9,502

Operating income
1,398

2,474

2,213

1,717

Net income
746

1,485

1,315

980

Basic earnings per share
$
0.91

$
1.85

$
1.67

$
1.26

Diluted earnings per share
$
0.90

$
1.83

$
1.65

$
1.25