Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 83	$ 72
Preferred stock, par (in dollars per share)	$ 1	$ 1
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par (in dollars per share)	$ 0.1667	$ 0.1667
Common stock, authorized (in shares)	300,000,000	300,000,000
Common stock, issued (in shares)	198,648,742	198,648,742
Treasury stock (in shares)	69,846,758	69,787,914