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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Current Assets:    
Allowance for uncollectible accounts $ 16 $ 17
Allowance for obsolescence 124 123
Noncurrent Assets:    
Accumulated depreciation and amortization 22,156 21,707
Accumulated amortization $ 913 $ 911
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) 657,166,677 654,671,194
Treasury stock, at cost (shares) 11,854,394 11,224,246