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Selected Quarterly Financial Data
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Data [Abstract]  
Selected Quarterly Financial Data
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
 
2018
 
2017
(In millions, except per share data)
1st Qtr.
 
2nd Qtr.
 
3rd Qtr.
 
4th Qtr.
 
1st Qtr.
 
2nd Qtr.
 
3rd Qtr.
 
4th Qtr.(a)
Sales and other operating revenues(b)
$
18,866

 
$
22,317

 
$
22,988

 
$
32,333

 
$
16,288

 
$
18,180

 
$
19,210

 
$
21,055

Income from operations
440

 
1,711

 
1,403

 
2,017

 
291

 
982

 
1,577

 
1,168

Net income
235

 
1,235

 
941

 
1,195

 
101

 
574

 
1,004

 
2,125

Net income attributable to MPC
37

 
1,055

 
737

 
951

 
30

 
483

 
903

 
2,016

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income attributable to MPC per share(c):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.08

 
$
2.30

 
$
1.63

 
$
1.38

 
$
0.06

 
$
0.94

 
$
1.79

 
$
4.13

Diluted
0.08

 
2.27

 
1.62

 
1.35

 
0.06

 
0.93

 
1.77

 
4.09


(a) 
During the fourth quarter of 2017, we recorded a tax benefit of approximately $1.5 billion as a result of remeasuring certain deferred tax liabilities using the lower corporate tax rate enacted under the TCJA.
(b) 
Includes sales to related parties. The 2018 periods reflect an election to present certain taxes on a net basis concurrent with our adoption of ASC 606.
(c)  
The sum of the per-share amounts for the four quarters may not always equal the annual per-share amounts due to differences in the average number of shares outstanding during the respective periods.