Basic and Diluted Earnings Per Share (Table) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings (loss)	$ 147	$ 133	$ 266	$ 269
Weighted-average common shares outstanding (in shares)	45.7	47.0	46.0	47.0
Net dilutive effect of stock options and awards (in shares)	0.1	0.5	0.1	0.4
Dilutive weighted-average common shares outstanding (in shares)	45.8	47.5	46.1	47.4
Earnings (loss) per share - basic (in dollars per share)	$ 3.22	$ 2.83	$ 5.78	$ 5.72
Earnings (loss) per share - diluted (in dollars per share)	$ 3.21	$ 2.80	$ 5.77	$ 5.68