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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Current Assets:    
Allowance for uncollectible accounts $ 121 $ 13
Allowance for obsolescence 135 82
Noncurrent Assets:    
Accumulated depreciation and amortization 17,267 17,027
Accumulated amortization $ 878 $ 873
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) 647,454,215 651,731,443
Treasury stock, at cost (shares) 9,597,469 8,959,730