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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (Unaudited) QUARTERLY FINANCIAL DATA (UNAUDITED)

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.

We recast certain 2018 quarterly amounts to conform with the adoption of the lease standard effective January 1, 2018.
As recast for lease accounting standard
Three Months Ended,
(in millions, except per share data)
March 31
June 30
September 30
December 31
2018
 
 
 
 
Operating revenue
$
9,968

$
11,775

$
11,953

$
10,742

Operating income
844

1,684

1,645

1,090

Net income
557

1,036

1,322

1,019

Basic earnings per share
$
0.79

$
1.49

$
1.93

$
1.50

Diluted earnings per share
$
0.79

$
1.49

$
1.92

$
1.49



As previously reported
Three Months Ended,
 
(in millions, except per share data)
March 31
June 30
September 30
 
2018
 
 
 
 
Operating revenue
$
9,968

$
11,775

$
11,953

 
Operating income
840

1,680

1,642

 
Net income
547

1,025

1,312

 
Basic earnings per share
$
0.78

$
1.47

$
1.91

 
Diluted earnings per share
$
0.77

$
1.47

$
1.91

 


As disclosed in our 2018 Form 10-Qs, we recast certain 2017 quarterly amounts to conform with the adoption of the revenue recognition and retirement benefits standards.
 
Three Months Ended,
(in millions, except per share data)
March 31
June 30
September 30
December 31
2017
 
 
 
 
Operating revenue
$
9,101

$
10,747

$
11,061

$
10,229

Operating income
999

1,982

1,823

1,162

Net income
561

1,186

1,159

299

Basic earnings per share
$
0.77

$
1.63

$
1.62

$
0.42

Diluted earnings per share
$
0.77

$
1.62

$
1.61

$
0.42