Earnings Per Share (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Weighted average number of shares outstanding - basic	123	143	144
Dilutive effect of employee stock plans	0	1	2
Weighted average number of shares outstanding, diluted	123	144	146
Adjusted weighted average shares	123	144	146
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,000,000