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