v2.4.1.9
Selected Quarterly Data (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2014
Selected Quarterly Data (Unaudited) [Abstract]  
Selected Quarterly Data (Unaudited) [Table Text Block]

20. Selected Quarterly Data (Unaudited)

Millions, Except Per Share Amounts        
2014Mar. 31Jun. 30Sep. 30Dec. 31
Operating revenues$ 5,638$ 6,015$ 6,182$ 6,153
Operating income  1,854  2,196  2,330  2,373
Net income  1,088  1,291  1,370  1,431
Net income per share:        
Basic  1.20  1.43  1.53  1.62
Diluted  1.19  1.43  1.53  1.61
         
Millions, Except Per Share Amounts        
2013Mar. 31Jun. 30Sep. 30Dec. 31
Operating revenues$ 5,290$ 5,470$ 5,573$ 5,630
Operating income  1,633  1,878  1,962  1,973
Net income  957  1,106  1,151  1,174
Net income per share:        
Basic  1.02  1.19  1.25  1.28
Diluted  1.02  1.18  1.24  1.27