Quarterly Supplementary Data (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Financial Information

This table includes unaudited quarterly financial information for the years ended December 31, 2016 and 2015:

(Dollars in millions except per share data)	Quarter
	1st		2nd		3rd		4th		Full year
2016
Revenues	$	1,364	$	1,371	$	1,402	$	1,312	$	5,449
Income before income taxes	265		166		253		128		812
Net income	188		123		180		100		591
Net income per common share—basic	1.14		0.75		1.09		0.61		3.59
Net income per common share—diluted	1.13		0.74		1.08		0.60		3.55
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