Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Current Assets:
Allowance for uncollectible accounts	$ 16	$ 18
Allowance for obsolescence	118	120
Noncurrent Assets:
Accumulated depreciation and amortization	24,273	23,228
Accumulated amortization	$ 926	$ 919
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)	659,443,488	654,571,606
Treasury stock, at cost (shares)	6,480,720	8,098,971