Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data (Unaudited)

Schedule of quarterly financial information

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Total
	(Dollars in millions, except per share amounts)
2012
Operating revenues	$	4,610		4,612		4,571		4,583		18,376
Operating income		654		657		736		666		2,713
Net income		200		74		270		233		777
Basic earnings per common share		.32		.12		.43		.37		1.25
Diluted earnings per common share		.32		.12		.43		.37		1.25
2011
Operating revenues	$	1,696		4,406		4,596		4,653		15,351
Operating income		464		480		548		533		2,025
Net income		211		115		138		109		573
Basic earnings per common share		.69		.19		.22		.18		1.07
Diluted earnings per common share		.69		.19		.22		.18		1.07