CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Restricted cash (includes $345 million and $282 million related to VIEs at respective dates)	$ 362	$ 297
Allowance for doubtful accounts	400	445
Customers (net of allowance for doubtful accounts of $400 million and $445 million at respective dates) (includes $1.8 billion and $1.7 billion related to VIEs, net of allowance for doubtful accounts of $400 million and $445 million at respective dates)	2,160	2,048
Accrued unbilled revenue (includes $1.2 billion and $1.1 billion related to VIEs at respective dates)	1,323	1,254
Long-term debt, classified as current (includes $177 million and $176 million related to VIEs at respective dates)	926	1,376
Interest payable (includes $136 million and $67 million related to VIEs at respective dates)	581	679
Long-term debt (includes $10.4 billion and $10.4 billion related to VIEs at respective dates)	$ 53,415	$ 50,975
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)	2,137,156,228	2,133,597,758
Treasury stock, shares at cost (in shares)	0	0
Variable Interest Entity, Primary Beneficiary
Restricted cash (includes $345 million and $282 million related to VIEs at respective dates)	$ 345	$ 282
Allowance for doubtful accounts	400	445
Customers (net of allowance for doubtful accounts of $400 million and $445 million at respective dates) (includes $1.8 billion and $1.7 billion related to VIEs, net of allowance for doubtful accounts of $400 million and $445 million at respective dates)	1,800	1,700
Accrued unbilled revenue (includes $1.2 billion and $1.1 billion related to VIEs at respective dates)	1,200	1,100
Long-term debt, classified as current (includes $177 million and $176 million related to VIEs at respective dates)	177	176
Interest payable (includes $136 million and $67 million related to VIEs at respective dates)	136	67
Long-term debt (includes $10.4 billion and $10.4 billion related to VIEs at respective dates)	$ 10,400	$ 10,400