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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Current Assets:    
Allowance for uncollectible accounts $ 24 $ 23
Allowance for obsolescence 134 136
Noncurrent Assets:    
Accumulated depreciation and amortization 20,881 20,370
Accumulated amortization $ 904 $ 902
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) 653,855,351 651,800,786
Treasury stock, at cost (shares) 11,138,728 10,535,033