CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Restricted cash and cash equivalents	$ 368	$ 273	$ 335
Allowance for doubtful accounts	408	418
Accounts receivable, after allowance for credit loss, current	2,343	2,220
Accrued unbilled revenue	1,633	1,487
Other (net of allowance for doubtful accounts)	82	35
Long-term debt, classified as current	2,769	2,146
Interest payable	657	760
Long-term debt	$ 55,531	$ 53,569
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	3,600,000,000	3,600,000,000
Common stock, shares outstanding (in shares)	2,197,837,402	2,193,573,536
Variable Interest Entity, Primary Beneficiary
Restricted cash and cash equivalents	$ 334	$ 263
Allowance for doubtful accounts	407	418
Accounts receivable, after allowance for credit loss, current	2,000	1,900
Accrued unbilled revenue	1,400	1,300
Noncurrent accounts receivable	71	82
Allowance for doubtful accounts, noncurrent	15	18
Long-term debt, classified as current	218	222
Interest payable	156	91
Long-term debt	$ 11,800	$ 10,100