Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating activities
Net income	$ 508	$ 691	$ 1,113	$ 2,602
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	3,313	4,145	10,389	12,511
Stock-based compensation expense	150	131	445	403
Deferred income tax (benefit) expense	(36)	(27)	73	410
Bad debt expense	239	105	760	259
Losses (gains) from sales of receivables	60	4	168	(26)
Losses on redemption of debt	0	55	0	184
Impairment expense	0	0	477	0
Loss on disposal group held for sale	371	0	371	0
Changes in operating assets and liabilities
Accounts receivable	(1,224)	(454)	(3,781)	(2,197)
Equipment installment plan receivables	(77)	(530)	(801)	(1,825)
Inventories	(7)	41	384	904
Operating lease right-of-use assets	1,113	1,334	4,275	3,730
Other current and long-term assets	(334)	(88)	(450)	(188)
Accounts payable and accrued liabilities	342	111	319	(1,245)
Short- and long-term operating lease liabilities	(700)	(2,046)	(2,218)	(4,411)
Other current and long-term liabilities	550	(87)	587	(351)
Other, net	123	92	334	157
Net cash provided by operating activities	4,391	3,477	12,445	10,917
Investing activities
Purchases of property and equipment, including capitalized interest of $(16), $(46), $(44), and $(187)	(3,634)	(2,944)	(10,587)	(9,397)
Purchases of spectrum licenses and other intangible assets, including deposits	(360)	(407)	(3,319)	(9,337)
Proceeds from sales of tower sites	0	0	0	31
Proceeds related to beneficial interests in securitization transactions	1,308	1,071	3,614	3,099
Acquisition of companies, net of cash and restricted cash acquired	0	(1,886)	(52)	(1,916)
Other, net	131	14	138	46
Net cash used in investing activities	(2,555)	(4,152)	(10,206)	(17,474)
Financing activities
Proceeds from issuance of long-term debt	2,972	1,989	2,972	11,758
Repayments of financing lease obligations	(311)	(266)	(901)	(822)
Repayments of short-term debt for purchases of inventory, property and equipment and other financial liabilities	0	(76)	0	(167)
Repayments of long-term debt	(132)	(4,600)	(3,145)	(9,969)
Repurchases of common stock	(557)	0	(557)	0
Tax withholdings on share-based awards	(10)	(14)	(225)	(308)
Cash payments for debt prepayment or debt extinguishment costs	0	(45)	0	(116)
Other, net	(35)	(48)	(97)	(139)
Net cash provided by (used in) financing activities	1,927	(3,060)	(1,953)	237
Change in cash and cash equivalents, including restricted cash and cash held for sale	3,763	(3,735)	286	(6,320)
Cash and cash equivalents, including restricted cash and cash held for sale
Beginning of period	3,226	7,878	6,703	10,463
End of period	$ 6,989	$ 4,143	$ 6,989	$ 4,143