Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2	$ 2
Common Stock, Shares Authorized	200,000,000
Common Stock, Shares, Issued	100,884,145	102,415,883
Common Stock, Shares, Outstanding	84,496,113	85,636,154
Treasury Stock, Shares	16,388,032	16,779,729