Selected Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Selected Quarterly Data (Unaudited) [Abstract]

Selected Quarterly Data (Unaudited)

Millions, Except Per Share Amounts
2016	Mar. 31		Jun. 30		Sep. 30		Dec. 31
Operating revenues	$	4,829	$	4,770	$	5,174	$	5,168
Operating income		1,687		1,660		1,960		1,965
Net income		979		979		1,131		1,144
Net income per share:
Basic		1.16		1.17		1.36		1.40
Diluted		1.16		1.17		1.36		1.39

Millions, Except Per Share Amounts
2015	Mar. 31		Jun. 30		Sep. 30		Dec. 31
Operating revenues	$	5,614	$	5,429	$	5,562	$	5,208
Operating income		1,977		1,949		2,208		1,918
Net income		1,151		1,204		1,300		1,117
Net income per share:
Basic		1.31		1.38		1.51		1.31
Diluted		1.30		1.38		1.50		1.31