Quarterly Supplementary Data (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Financial Information

This table includes unaudited quarterly financial information for the years ended December 31, 2015 and 2014:

(Dollars in millions except per share data)	Quarter
	1st		2nd		3rd		4th		Full year
2015
Revenues	$	1,285	$	1,316	$	1,278	$	1,263	$	5,142
Income before income taxes	174		248		243		216		881
Net income	128		176		174		156		634
Net income per common share—basic	0.78		1.07		1.06		0.95		3.87
Net income per common share—diluted	0.77		1.06		1.05		0.94		3.83
2014
Revenues	$	1,189	$	1,214	$	1,280	$	1,262	$	4,945
Income before income taxes	119		107		259		236		721
Net income	91		84		183		167		525
Net income per common share—basic	0.56		0.51		1.12		1.03		3.21
Net income per common share—diluted	0.55		0.51		1.11		1.02		3.18