v3.20.4
Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities      
Net income $ 3,064 $ 3,468 $ 2,888
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation and amortization 14,151 6,616 6,486
Stock-based compensation expense 694 495 424
Deferred income tax expense 822 1,091 980
Bad debt expense 602 307 297
Losses from sales of receivables 36 130 157
Deferred rent expense 0 0 26
Losses on redemption of debt 371 19 122
Impairment expense 418 0 0
Changes in operating assets and liabilities      
Accounts receivable (3,273) (3,709) (4,617)
Equipment installment plan receivables (1,453) (1,015) (1,598)
Inventories (2,222) (617) (201)
Operating lease right-of-use assets 3,465 1,896 0
Other current and long-term assets (402) (144) (181)
Accounts payable and accrued liabilities (2,123) 17 (867)
Short and long-term operating lease liabilities (3,699) (2,131) 0
Other current and long-term liabilities (2,178) 144 (69)
Other, net 367 257 52
Net cash provided by operating activities 8,640 6,824 3,899
Investing activities      
Purchases of property and equipment, including capitalized interest of $440, $473 and $362 (11,034) (6,391) (5,541)
Purchases of spectrum licenses and other intangible assets, including deposits (1,333) (967) (127)
Proceeds from sales of tower sites 0 38 0
Proceeds related to beneficial interests in securitization transactions 3,134 3,876 5,406
Net cash related to derivative contracts under collateral exchange arrangements 632 (632) 0
Acquisition of companies, net of cash and restricted cash acquired (5,000) (31) (338)
Proceeds from the divestiture of prepaid business 1,224 0 0
Other, net (338) (18) 21
Net cash used in investing activities (12,715) (4,125) (579)
Financing activities      
Proceeds from issuance of long-term debt 35,337 0 2,494
Payments of consent fees related to long-term debt (109) 0 0
Proceeds from borrowing on revolving credit facility 0 2,340 6,265
Repayments of revolving credit facility 0 (2,340) (6,265)
Repayments of financing lease obligations (1,021) (798)  
Repayments of financing lease obligations     (700)
Repayments of short-term debt for purchases of inventory, property and equipment and other financial liabilities (481) (775) (300)
Repayments of long-term debt (20,416) (600) (3,349)
Issuance of common stock 19,840 0 0
Repurchases of common stock (19,536) 0 (1,071)
Proceeds from issuance of short-term debt 18,743 0 0
Repayments of short-term debt (18,929) 0 0
Tax withholdings on share-based awards (439) (156) (146)
Cash payments for debt prepayment or debt extinguishment costs (82) (28) (212)
Other, net 103 (17) (52)
Net cash provided by (used in) financing activities 13,010 (2,374) (3,336)
Change in cash and cash equivalents, including restricted cash 8,935 325 (16)
Cash and cash equivalents, including restricted cash      
Beginning of period 1,528 1,203 1,219
End of period $ 10,463 $ 1,528 $ 1,203