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Consolidated Statements of Cash Flows
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
CASH FLOWS FROM OPERATING ACTIVITIES        
Income before income tax $ 663,036.0 $ 23,901.8 $ 584,746.3 $ 389,862.1
Adjustments for:        
Depreciation expense 414,187.7 14,931.1 324,538.4 281,411.8
Amortization expense 8,207.2 295.9 7,186.2 5,472.4
Expected credit losses recognized (reversal) on investments in debt instruments (2.7) (0.1) 3.7 1.7
Finance costs 5,414.2 195.2 2,081.5 3,250.9
Share of profits of associates (5,512.7) (198.7) (3,562.0) (2,861.0)
Interest income (5,708.8) (205.8) (9,018.4) (16,189.4)
Share-based compensation 7.8 0.3 6.6 2.8
Loss (gain) on disposal or retirement of property, plant and equipment, net 273.6 9.9 (188.9) 950.0
Loss on disposal or retirement of intangible assets, net 1.2   0.6 2.4
Impairment loss (reversal of impairment loss) on property, plant and equipment 274.4 9.9 10.2 (301.4)
Loss (gain) on financial instruments at fair value through profit or loss, net     (3.0) 955.7
Gain on disposal of investments in debt instruments at fair value through other comprehensive income, net (93.2) (3.4) (1,439.4) (537.8)
Loss from disposal of subsidiaries       4.6
Gain on foreign exchange, net (16,115.9) (581.0) (1,372.6) (5,228.2)
Dividend income (362.3) (13.1) (637.6) (417.3)
Gain arising from fair value hedges, net       (13.1)
Others (414.2) (15.0) 13.5 (5.5)
Changes in operating assets and liabilities:        
Financial instruments at fair value through profit or loss 2,649.2 95.5 (2,965.2) 848.8
Notes and accounts receivable, net (52,105.9) (1,878.4) (8,082.7) (18,119.6)
Receivables from related parties (157.2) (5.7) 304.0 (277.7)
Other receivables from related parties (10.9) (0.4) 7.6 13.4
Inventories (55,748.9) (2,009.7) (54,372.2) 20,249.8
Other financial assets (8,236.9) (296.9) 1,389.5 3,383.5
Other current assets (3,899.0) (140.6) (1,358.1) (76.3)
Accounts payable 8,298.3 299.2 404.6 5,860.1
Payables to related parties (670.5) (24.2) 672.8 58.4
Salary and bonus payable 3,730.9 134.5 3,798.9 1,800.9
Accrued profit sharing bonus to employees and compensation to directors and supervisors 843.7 30.4 12,032.1 (332.2)
Accrued expenses and other current liabilities 84,322.7 3,039.8 20,617.4 (2,372.0)
Other noncurrent liabilities 154,086.0 5,554.7    
Net defined benefit liability (635.2) (22.9) (785.2) (215.0)
Cash generated from operations 1,195,658.6 43,102.3 874,028.6 667,182.8
Income taxes paid (83,497.9) (3,010.0) (51,362.4) (52,044.1)
Net cash generated by operating activities 1,112,160.7 40,092.3 822,666.2 615,138.7
CASH FLOWS FROM INVESTING ACTIVITIES        
Acquisitions of financial instruments at fair value through profit or loss - debt instruments       (124.7)
Acquisitions of financial assets at fair value through other comprehensive income (255,888.7) (9,224.5) (262,637.5) (257,558.2)
Acquisitions of financial assets at amortized cost (3,799.7) (137.0) (4,302.8) (313.9)
Acquisitions of property, plant and equipment (839,195.7) (30,252.2) (507,238.7) (460,422.2)
Acquisitions of intangible assets (9,040.7) (325.9) (9,542.4) (9,329.9)
Proceeds from disposal or redemption of financial instruments at fair value through profit or loss - debt instruments     30.0 2,418.2
Proceeds from disposal or redemption of financial assets at fair value through other comprehensive income 254,604.5 9,178.2 266,931.9 230,444.5
Proceeds from disposal or redemption of financial assets at amortized cost 9,368.3 337.7 285.2 14,349.2
Proceeds from disposal or redemption of property, plant and equipment 390.4 14.1 606.7 287.3
Proceeds from return of capital of investments in equity instruments at fair value through other comprehensive income 115.6 4.2 51.1 1.1
Derecognition of hedging financial instruments 276.3 10.0 (308.8) (436.6)
Interest received 5,990.9 216.0 9,775.1 16,875.0
Other dividends received 362.3 13.1 735.1 320.2
Dividends received from investments accounted for using equity method 2,136.4 77.0 2,752.1 1,719.0
Increase in prepayments for leases (1,200.0) (43.3) (4,693.4)  
Refundable deposits paid (1,997.3) (72.0) (726.9) (1,465.8)
Refundable deposits refunded 683.7 24.6 1,431.9 1,019.3
Net cash used in investing activities (836,365.8) (30,150.2) (505,781.7) (458,801.6)
CASH FLOWS FROM FINANCING ACTIVITIES        
Increase (decrease) in short-term loans 35,668.4 1,285.8 (31,571.6) 31,804.3
Proceeds from short-term bills payable     7,485.3  
Repayments of short-term bills payable     (7,500.0)  
Proceeds from issuance of bonds 364,592.8 13,143.2 236,725.7  
Repayment of bonds (2,600.0) (93.7) (31,800.0) (34,900.0)
Proceeds from long-term bank loans 1,510.0 54.5 2,000.0  
Payments for transaction costs attributable to the issuance of bonds (737.7) (26.6) (390.7)  
Repayment of the principal portion of lease liabilities (1,985.3) (71.6) (2,615.7) (2,930.6)
Interest paid (3,833.6) (138.2) (1,781.1) (3,597.1)
Guarantee deposits received 469.0 16.9 145.6 62.2
Guarantee deposits refunded (36.8) (1.3) (16.1) (701.3)
Cash dividends (265,786.4) (9,581.3) (259,303.8) (259,303.8)
Disposal of ownership interests in subsidiaries (without losing control) 9,451.8 340.7    
Donation from shareholders 11.3 0.4 7.3 4.0
Decrease in non-controlling interests (115.0) (4.2)   (75.9)
Net cash generated by (used in) financing activities 136,608.5 4,924.6 (88,615.1) (269,638.2)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (7,583.8) (273.3) (23,498.1) (9,114.2)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 404,819.6 14,593.4 204,771.3 (122,415.3)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 660,170.6 23,798.5 455,399.3 577,814.6
CASH AND CASH EQUIVALENTS, END OF YEAR 1,064,990.2 38,391.9 660,170.6 455,399.3
Land use right and others [member]        
CASH FLOWS FROM INVESTING ACTIVITIES        
Proceeds from government grants 6.6 0.2 25.4 850.6
Property, plant and equipment [member]        
CASH FLOWS FROM INVESTING ACTIVITIES        
Proceeds from government grants $ 821.3 $ 29.6 $ 1,044.3 $ 2,565.3