Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for Accounts Receivable	$ 113	$ 123
Accumulated Depreciation	$ 11,233	$ 11,130
Common Stock, par value (in dollars per share)	$ 0	$ 0
Common Stock, shares authorized (in shares)	450,000,000	450,000,000
Common Stock, shares outstanding (in shares)	282,000,000	282,000,000