CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
CONSOLIDATED BALANCE SHEETS
Allowance for doubtful accounts	$ 184	$ 165
Allowance for other receivables	3	4
Accumulated depreciation and amortization	$ 24,100	$ 23,777
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,500,000,000	1,500,000,000
Common stock, shares issued	630,282,461	630,282,461
Treasury stock, shares	227,911,432	228,788,284