Consolidated Balance Sheet (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts, accounts receivable	$ 954	$ 990
Allowance for doubtful accounts, other receivables	993	1,047
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	5,992	5,230
Finite-lived Intangible Assets, Accumulated Amortization	$ 5,636	$ 5,455
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	3,000	3,000
Common stock, shares issued	941	946
Common Stock, shares outstanding	941	946
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10	10
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0