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Consolidated Statements of Cash Flows
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
CASH FLOWS FROM OPERATING ACTIVITIES        
Income before income tax $ 584,746.3 $ 20,824.3 $ 389,862.1 $ 397,543.1
Adjustments for:        
Depreciation expense 324,538.4 11,557.6 281,411.8 288,124.9
Amortization expense 7,186.2 255.9 5,472.4 4,421.4
Expected credit losses recognized (reversal) on investments in debt instruments 3.7 0.1 1.7 (2.4)
Finance costs 2,081.5 74.1 3,250.9 3,051.2
Share of profits of associates (3,562.0) (126.8) (2,861.0) (3,090.6)
Interest income (9,018.4) (321.2) (16,189.4) (14,694.4)
Share-based compensation 6.6 0.2 2.8  
Loss (gain) on disposal or retirement of property, plant and equipment, net (188.9) (6.7) 950.0 1,005.6
Loss (gain) on disposal of intangible assets, net 0.6   2.4 (0.4)
Impairment loss (reversal of impairment loss) on property, plant and equipment 10.2 0.4 (301.4) 423.5
Loss (gain) on financial instruments at fair value through profit or loss, net (3.0) (0.1) 955.7 358.2
Loss (gain) on disposal of investments in debt instruments at fair value through other comprehensive income, net (1,439.4) (51.3) (537.8) 989.1
Loss from disposal of subsidiaries     4.6  
Unrealized (realized) gross profit on sales to associates 16.3 0.6 (3.4) 111.8
Loss (gain) on foreign exchange, net (1,372.6) (48.9) (5,228.2) 2,916.7
Dividend income (637.6) (22.7) (417.3) (158.4)
Loss (gain) arising from fair value hedges, net     (13.1) 2.3
Gain on lease modification (2.8) (0.1) (2.1)  
Changes in operating assets and liabilities:        
Financial instruments at fair value through profit or loss (2,965.2) (105.6) 848.8 480.1
Notes and accounts receivable, net (8,082.7) (287.8) (18,119.6) (13,271.3)
Receivables from related parties 304.0 10.8 (277.7) 599.7
Other receivables from related parties 7.6 0.3 13.4 106.1
Inventories (54,372.2) (1,936.3) 20,249.8 (29,370.0)
Other financial assets 1,389.5 49.5 3,383.5 (4,601.3)
Other current assets (1,358.1) (48.4) (76.3) (513.0)
Other noncurrent assets       152.6
Accounts payable 404.6 14.4 5,860.1 4,540.6
Payables to related parties 672.8 24.0 58.4 (279.9)
Salary and bonus payable 3,798.9 135.3 1,800.9 216.5
Accrued profit sharing bonus to employees and compensation to directors and supervisors 12,032.1 428.5 (332.2) 562.0
Accrued expenses and other current liabilities 20,617.4 734.2 (2,372.0) (20,226.4)
Net defined benefit liability (785.2) (28.0) (215.0) (60.5)
Cash generated from operations 874,028.6 31,126.3 667,182.8 619,336.8
Income taxes paid (51,362.4) (1,829.1) (52,044.1) (45,382.5)
Net cash generated by operating activities 822,666.2 29,297.2 615,138.7 573,954.3
CASH FLOWS FROM INVESTING ACTIVITIES        
Acquisitions of financial instruments at fair value through profit or loss - debt instruments     (124.7) (310.5)
Acquisitions of financial assets at fair value through other comprehensive income (262,637.5) (9,353.2) (257,558.2) (96,412.8)
Acquisitions of financial assets at amortized cost (4,302.8) (153.2) (313.9) (2,294.1)
Acquisitions of property, plant and equipment (507,238.7) (18,064.1) (460,422.2) (315,581.9)
Acquisitions of intangible assets (9,542.4) (339.8) (9,329.9) (7,100.3)
Proceeds from disposal or redemption of financial instruments at fair value through profit or loss - debt instruments 30.0 1.1 2,418.2 487.2
Proceeds from disposal or redemption of financial assets at fair value through other comprehensive income 266,931.9 9,506.1 230,444.5 86,639.3
Proceeds from disposal or redemption of financial assets at amortized cost 285.2 10.2 14,349.2 2,032.4
Proceeds from disposal or redemption of property, plant and equipment 606.7 21.6 287.3 181.5
Proceeds from disposal or redemption of intangible assets       0.5
Proceeds from return of capital of investments in equity instruments at fair value through other comprehensive income 51.1 1.8 1.1 127.9
Derecognition of hedging financial instruments (308.8) (11.0) (436.6) 250.5
Interest received 9,775.1 348.1 16,875.0 14,660.4
Other dividends received 735.1 26.2 320.2 158.4
Dividends received from investments accounted for using equity method 2,752.1 98.0 1,719.0 3,262.9
Increase in prepayments for leases (4,693.4) (167.1)    
Refundable deposits paid (726.9) (25.9) (1,465.8) (2,227.5)
Refundable deposits refunded 1,431.9 51.0 1,019.3 1,857.2
Net cash used in investing activities (505,781.7) (18,012.1) (458,801.6) (314,268.9)
CASH FLOWS FROM FINANCING ACTIVITIES        
Increase (decrease) in short-term loans (31,571.6) (1,124.3) 31,804.3 23,923.0
Proceeds from short-term bills payable 7,485.3 266.6    
Repayments of short-term bills payable (7,500.0) (267.1)    
Proceeds from issuance of bonds 236,725.7 8,430.4    
Repayment of bonds (31,800.0) (1,132.5) (34,900.0) (58,024.9)
Proceeds from long-term bank loans 2,000.0 71.2    
Payments for transaction costs attributable to the issuance of bonds (390.7) (13.9)    
Repayment of the principal portion of lease liabilities (2,615.7) (93.2) (2,930.6)  
Interest paid (1,781.1) (63.4) (3,597.1) (3,233.4)
Guarantee deposits received 145.6 5.2 62.2 1,668.9
Guarantee deposits refunded (16.1) (0.6) (701.3) (1,948.1)
Cash dividends (259,303.8) (9,234.5) (259,303.8) (207,443.0)
Donation from shareholders 7.3 0.3 4.0 10.1
Decrease in non-controlling interests     (75.9) (77.4)
Net cash used in financing activities (88,615.1) (3,155.8) (269,638.2) (245,124.8)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (23,498.1) (836.8) (9,114.2) 9,862.3
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 204,771.3 7,292.5 (122,415.3) 24,422.9
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 455,399.3 16,217.9 577,814.6 553,391.7
CASH AND CASH EQUIVALENTS, END OF YEAR 660,170.6 23,510.4 455,399.3 $ 577,814.6
Land use right and others [member]        
CASH FLOWS FROM INVESTING ACTIVITIES        
Proceeds from government grants 25.4 0.9 850.6  
Property, plant and equipment [member]        
CASH FLOWS FROM INVESTING ACTIVITIES        
Proceeds from government grants $ 1,044.3 $ 37.2 $ 2,565.3