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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Current Assets:    
Allowance for uncollectible accounts $ 23 $ 50
Allowance for obsolescence 136 176
Noncurrent Assets:    
Accumulated depreciation and amortization 20,370 18,671
Accumulated amortization $ 902 $ 893
Stockholders' Equity:    
Common stock, par value (USD per share) $ 0.0001 $ 0.0001
Common stock, authorized (shares) 1,500,000,000 1,500,000,000
Common stock, issued (shares) 651,800,786 649,720,387
Treasury stock, at cost (shares) 10,535,033 9,752,872