CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Restricted cash (includes $201 million and $4 million related to VIEs at respective dates)	$ 213	$ 16
Allowance for doubtful accounts	166	171
Customers (net of allowance for doubtful accounts of $166 million and $171 million at respective dates) (includes $2.47 billion and $2.06 billion related to VIEs, net of allowance for doubtful accounts of $166 million and $171 million at respective dates)	2,645	2,345
Accrued unbilled revenue (includes $1.16 billion and $1.09 billion related to VIEs at respective dates)	1,304	1,207
Long-term debt, classified as current (includes $168 million and $18 million related to VIEs at respective dates)	2,268	4,481
Interest payable (includes $116 million and $3 million related to VIEs at respective dates)	626	481
Long-term debt (includes $10.31 billion and $1.82 billion related to VIEs at respective dates)	$ 47,742	$ 38,225
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)	1,987,784,948	1,985,400,540
Treasury stock, shares at cost (in shares)	247,743,590	477,743,590
Variable Interest Entity, Primary Beneficiary
Restricted cash (includes $201 million and $4 million related to VIEs at respective dates)	$ 201	$ 4
Allowance for doubtful accounts	166	171
Customers (net of allowance for doubtful accounts of $166 million and $171 million at respective dates) (includes $2.47 billion and $2.06 billion related to VIEs, net of allowance for doubtful accounts of $166 million and $171 million at respective dates)	2,470	2,060
Accrued unbilled revenue (includes $1.16 billion and $1.09 billion related to VIEs at respective dates)	1,160	1,090
Net noncurrent accounts receivable	17	187
Noncurrent allowance for doubtful accounts	1	15
Long-term debt, classified as current (includes $168 million and $18 million related to VIEs at respective dates)	168	18
Interest payable (includes $116 million and $3 million related to VIEs at respective dates)	116	3
Long-term debt (includes $10.31 billion and $1.82 billion related to VIEs at respective dates)	$ 10,310	$ 1,820