Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data (Unaudited)

	2014 Quarter Ended
(In millions, except per share amounts)	Dec. 31		Sept. 30		June 30		Mar. 31
Revenue	$	1,042	$	963	$	1,005	$	906
Gross profit	407		376		388		342
Operating income	141		130		116		76
Net income	$	96	$	106	$	86	$	49
Earnings per share:
Basic	$	0.53	$	0.58	$	0.47	$	0.27
Diluted	$	0.52	$	0.58	$	0.47	$	0.27

	2013 Quarter Ended
(In millions, except per share amounts)	Dec. 31		Sept. 30		June 30		Mar. 31
Revenue	$	1,033	$	965	$	960	$	879
Gross profit	410		384		371		334
Operating income	129		98		70		66
Net income	$	68	$	73	$	46	$	41
Earnings per share:
Basic	$	0.37	$	0.39	$	0.25	$	0.22
Diluted	$	0.37	$	0.39	$	0.25	$	0.22