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Consolidated Statements of Cash Flows
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
CASH FLOWS FROM OPERATING ACTIVITIES        
Income before income tax $ 397,543.1 $ 12,987.4 $ 396,161.9 $ 385,921.7
Adjustments for:        
Depreciation expense 288,124.9 9,412.8 255,796.0 220,085.0
Amortization expense 4,421.4 144.5 4,346.7 3,743.4
Reversal of expected credit losses on investments in debt instruments (2.4) (0.1)    
Finance costs 3,051.2 99.7 3,330.3 3,306.1
Share of profits of associates (3,090.6) (101.0) (3,014.8) (3,457.9)
Interest income (14,694.4) (480.0) (9,464.7) (6,317.5)
Loss (gain) on disposal or retirement of property, plant and equipment, net 1,005.6 32.9 1,097.9 (46.5)
Gain on disposal of intangible assets, net (0.4)      
Impairment loss on property, plant and equipment 423.5 13.8    
Impairment loss on intangible assets     13.5  
Impairment loss on financial assets     29.6 122.2
Loss on financial instruments at fair value through profit or loss, net 358.2 11.7    
Loss on disposal of investments in debt instruments at fair value through other comprehensive income, net 989.1 32.3    
Gain on disposal of available-for-sale financial assets, net     (89.8) (33.2)
Loss on disposal of investments accounted for using equity method, net       260.0
Loss (gain) from disposal of subsidiaries     (17.3) 36.1
Unrealized gross profit on sales to associates 111.8 3.6 4.6 29.1
Loss (gain) on foreign exchange, net 2,916.7 95.3 (9,118.6) (2,656.4)
Dividend income (158.4) (5.2) (145.6) (137.4)
Loss (gain) arising from fair value hedges, net 2.3   30.3 (16.9)
Changes in operating assets and liabilities:        
Financial instruments at fair value through profit or loss 480.1 15.7 5,645.1 (6,326.6)
Notes and accounts receivable, net (13,271.3) (433.6) 1,061.8 (49,342.7)
Receivables from related parties 599.7 19.6 (214.6) (463.8)
Other receivables from related parties 106.1 3.5 (13.9) (21.8)
Inventories (29,370.0) (959.5) (25,229.1) 18,370.1
Other financial assets (4,601.3) (150.3) (502.3) (41.6)
Other current assets (513.0) (16.8) 12.1 94.5
Other noncurrent assets 152.6 5.0 (1,276.1) (349.8)
Accounts payable 4,540.6 148.3 2,572.1 7,295.4
Payables to related parties (279.9) (9.1) 394.2 139.8
Salary and bonus payable 216.5 7.1 582.1 1,979.8
Accrued profit sharing bonus to employees and compensation to directors and supervisors 562.0 18.4 525.1 1,935.1
Accrued expenses and other current liabilities (20,226.4) (660.8) 30,435.4 3,693.6
Provisions     (4,057.9) 7,931.9
Net defined benefit liability (60.5) (2.0) 44.6 46.2
Cash generated from operations 619,336.8 20,233.2 648,938.6 585,777.9
Income taxes paid (45,382.5) (1,482.6) (63,620.4) (45,943.3)
Net cash generated by operating activities 573,954.3 18,750.6 585,318.2 539,834.6
CASH FLOWS FROM INVESTING ACTIVITIES        
Acquisitions of financial instruments at fair value through profit or loss - debt instruments (310.5) (10.1)    
Acquisitions of financial assets at fair value through other comprehensive income (96,412.8) (3,149.7)    
Acquisitions of available-for-sale financial assets     (101,824.0) (83,809.3)
Acquisitions of held-to maturity financial assets     (1,997.1) (33,625.4)
Acquisitions of financial assets at amortized cost (2,294.1) (74.9)    
Acquisitions of property, plant and equipment (315,581.9) (10,309.8) (330,588.2) (328,045.3)
Acquisitions of intangible assets (7,100.3) (232.0) (4,480.6) (4,243.1)
Acquisitions of land use right     (819.7) (805.3)
Proceeds from disposal or redemption of financial instruments at fair value through profit or loss - debt instruments 487.2 15.9    
Proceeds from disposal or redemption of financial assets at fair value through other comprehensive income 86,639.3 2,830.4    
Proceeds from disposal or redemption of available-for-sale financial assets     69,538.9 30,128.5
Proceeds from disposal or redemption of held-to-maturity financial assets     17,980.6 10,550.0
Proceeds from disposal or redemption of financial assets at amortized cost 2,032.4 66.4    
Proceeds from disposal or redemption of property, plant and equipment 181.5 5.9 326.2 98.1
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 127.9 4.2    
Proceeds from return of capital of available-for-sale financial assets     14.8 65.1
Derecognition of hedging derivative financial instruments     33.0 8.9
Derecognition of hedging financial instruments 250.5 8.2    
Interest received 14,660.4 478.9 9,526.3 6,353.2
Cash outflow from disposal of subsidiary     (4.1)  
Other dividends received 158.4 5.2 145.6 137.4
Dividends received from investments accounted for using equity method 3,262.9 106.6 4,245.8 5,478.8
Refundable deposits paid (2,227.5) (72.8) (1,327.0) (145.0)
Refundable deposits refunded 1,857.2 60.7 433.0 169.9
Decrease in receivables for temporary payments       706.7
Net cash used in investing activities (314,268.9) (10,266.9) (336,164.9) (395,439.7)
CASH FLOWS FROM FINANCING ACTIVITIES        
Increase in short-term loans 23,923.0 781.5 10,394.3 18,968.9
Repayment of bonds (58,024.9) (1,895.6) (38,100.0) (23,471.6)
Repayment of long-term bank loans     (31.4) (8.5)
Interest paid (3,233.4) (105.6) (3,482.7) (3,302.4)
Guarantee deposits received 1,668.9 54.5 950.9 6,354.7
Guarantee deposits refunded (1,948.1) (63.6) (3,823.2) (523.3)
Cash dividends (207,443.0) (6,777.0) (181,512.7) (155,582.3)
Donation from shareholders 10.1 0.3 20.9  
Decrease in non-controlling interests (77.4) (2.5) (113.7) (235.7)
Net cash used in financing activities (245,124.8) (8,008.0) (215,697.6) (157,800.2)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 9,862.3 322.2 (21,317.8) (8,029.8)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 24,422.9 797.9 12,137.9 (21,435.1)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 553,391.7 18,078.8 541,253.8 562,688.9
CASH AND CASH EQUIVALENTS, END OF YEAR $ 577,814.6 $ 18,876.7 553,391.7 541,253.8
Land use right and others [member]        
CASH FLOWS FROM INVESTING ACTIVITIES        
Proceeds from government grants     1.8 798.5
Property, plant and equipment [member]        
CASH FLOWS FROM INVESTING ACTIVITIES        
Proceeds from government grants     $ 2,629.8 $ 738.6