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Selected Quarterly Data (Unaudited)
 12 Months Ended
Dec. 31, 2020
Selected Quarterly Data (Unaudited) [Abstract]  
Selected Quarterly Data (Unaudited) 20. Selected Quarterly Data (Unaudited)

Millions, Except Per Share Amounts

2020

Mar. 31

Jun. 30

Sep. 30

Dec. 31

Operating revenues

$

5,229 

$

4,244 

$

4,919 

$

5,141 

Operating income

2,143 

1,654 

2,031 

2,006 

Net income

1,474 

1,132 

1,363 

1,380 

Net income per share:

Basic

2.15 

1.67 

2.02 

2.05 

Diluted

2.15 

1.67 

2.01 

2.05 

Millions, Except Per Share Amounts

2019

Mar. 31

Jun. 30

Sep. 30

Dec. 31

Operating revenues

$

5,384 

$

5,596 

$

5,516 

$

5,212 

Operating income

1,960 

2,260 

2,234 

2,100 

Net income

1,391 

1,570 

1,555 

1,403 

Net income per share:

Basic

1.94 

2.23 

2.22 

2.03 

Diluted

1.93 

2.22 

2.22 

2.02 

Per share net income for the four quarters combined may not equal the per share net income for the year due to rounding.