Earnings Per Share (Calculation of EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic and diluted net earnings per share:
Net income (in usd)	$ 427	$ 254	$ 401
Net income	$ 427	$ 254	$ 401
Shares
Weighted average common shares outstanding	180,225	180,094	179,958
Add: Participating securities	22	22	29
Weighted average common shares outstanding — Basic	180,247	180,116	179,987
Plus incremental shares from assumed conversions:
Weighted average common shares outstanding — Diluted	181,526	181,099	181,196
Basic earnings per share (in usd per share)	$ 2.37	$ 1.41	$ 2.23
Diluted earnings per share (in usd per share)	$ 2.35	$ 1.40	$ 2.21
Stock Options
Plus incremental shares from assumed conversions:
Dilutive effect of common shares	871	671	803
Restricted Stock
Plus incremental shares from assumed conversions:
Dilutive effect of common shares	408	312	406