Basic and Diluted Earnings Per Share (Table) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings (loss)	$ 222	$ 154	$ 447	$ 400
Weighted-average common shares outstanding (in shares)	40.6	41.2	40.6	41.4
Net dilutive effect of stock options and awards (in shares)	0.1		0.1
Dilutive weighted-average common shares outstanding (in shares)	40.7	41.2	40.7	41.4
Earnings (loss) per share - basic (in dollars per share)	$ 5.47	$ 3.74	$ 11.01	$ 9.66
Earnings (loss) per share - diluted (in dollars per share)	$ 5.45	$ 3.74	$ 10.98	$ 9.66