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Consolidated Statements of Cash Flows
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
CASH FLOWS FROM OPERATING ACTIVITIES        
Income before income tax $ 396,161.9 $ 13,365.8 $ 385,921.7 $ 350,477.6
Adjustments for:        
Depreciation expense 255,796.0 8,630.1 220,085.0 219,303.4
Amortization expense 4,346.7 146.6 3,743.4 3,202.2
Finance costs 3,330.3 112.4 3,306.1 3,190.3
Share of profits of associates and joint venture (3,014.8) (101.7) (3,457.9) (4,196.4)
Interest income (9,464.7) (319.3) (6,317.5) (4,129.3)
Loss (gain) on disposal or retirement of property, plant and equipment, net 1,097.9 37.0 (46.5) (433.5)
Impairment loss on property, plant and equipment       2,545.6
Impairment loss on intangible assets 13.5 0.5   58.5
Impairment loss on financial assets 29.6 1.0 122.2 154.7
Gain on disposal of available-for-sale financial assets, net (89.8) (3.0) (33.2) (22,157.9)
Loss (gain) on disposal of investments accounted for using equity method, net     260.0 (2,492.1)
Loss (gain) from disposal of subsidiaries (17.3) (0.6) 36.1 138.2
Unrealized (realized) gross profit on sales to associates 4.6 0.2 29.1 (15.1)
Loss (gain) on foreign exchange, net (9,118.6) (307.6) (2,656.4) 2,563.4
Dividend income (145.6) (4.9) (137.4) (621.5)
Loss (gain) arising from fair value hedges, net 30.3 1.0 (16.9) 439.7
Gain from lease agreement modification       (430.0)
Changes in operating assets and liabilities:        
Financial instruments at fair value through profit or loss 5,645.1 190.4 (6,326.6) (228.6)
Notes and accounts receivable, net 1,061.8 35.8 (49,342.7) 26,630.1
Receivables from related parties (214.6) (7.2) (463.8) (192.8)
Other receivables from related parties (13.9) (0.5) (21.8) 53.6
Inventories (25,229.1) (851.2) 18,370.1 (655.2)
Other financial assets (502.3) (16.9) (41.6) 720.3
Other current assets 12.1 0.4 94.5 263.4
Other noncurrent assets (1,276.1) (43.1) (349.8)  
Accounts payable 2,572.1 86.8 7,295.4 (2,693.4)
Payables to related parties 394.2 13.3 139.8 (369.1)
Salary and bonus payable 582.1 19.6 1,979.8 945.0
Accrued profit sharing bonus to employees and compensation to directors and supervisors 525.1 17.7 1,935.1 2,860.3
Accrued expenses and other current liabilities 30,435.4 1,026.8 3,693.6 (3,778.3)
Provisions (4,057.9) (136.9) 7,931.9 (382.8)
Net defined benefit liability 44.6 1.5 46.2 52.5
Cash generated from operations 648,938.6 21,894.0 585,777.9 570,822.8
Income taxes paid (63,620.4) (2,146.4) (45,943.3) (40,943.4)
Net cash generated by operating activities 585,318.2 19,747.6 539,834.6 529,879.4
CASH FLOWS FROM INVESTING ACTIVITIES        
Acquisitions of available-for-sale financial assets (101,824.0) (3,435.4) (83,809.3) (15,978.5)
Acquisitions of held-to maturity financial assets (1,997.1) (67.4) (33,625.4) (28,181.9)
Acquisitions of property, plant and equipment (330,588.2) (11,153.4) (328,045.3) (257,516.8)
Acquisitions of intangible assets (4,480.6) (151.2) (4,243.1) (4,283.9)
Acquisitions of land use right (819.7) (27.6) (805.3)  
Proceeds from disposal or redemption of available-for-sale financial assets 69,538.9 2,346.1 30,128.5 57,861.8
Proceeds from disposal or redemption of held-to-maturity financial assets 17,980.6 606.6 10,550.0 16,800.0
Proceeds from disposal or redemption of investments accounted for using equity method       5,172.0
Proceeds from disposal or redemption of property, plant and equipment 326.2 11.0 98.1 816.9
Proceeds from return of capital of available-for-sale financial assets 14.8 0.5 65.1  
Derecognition of hedging derivative financial instruments 33.0 1.1 8.9 2.7
Costs from entering into hedging transactions       (495.3)
Interest received 9,526.3 321.4 6,353.2 3,641.9
Net cash outflow from acquisition of subsidiary (Note 33)       (51.6)
Net cash inflow from disposal of subsidiary (Note 34)       601.0
Cash outflow from disposal of subsidiary (4.1) (0.1)    
Other dividends received 145.6 4.9 137.4 616.7
Dividends received from investments accounted for using equity method 4,245.8 143.3 5,478.8 3,407.1
Refundable deposits paid (1,327.0) (44.8) (145.0) (404.5)
Refundable deposits refunded 433.0 14.6 169.9 348.4
Decrease in receivables for temporary payments     706.7 398.2
Net cash used in investing activities (336,164.9) (11,341.6) (395,439.7) (217,245.8)
CASH FLOWS FROM FINANCING ACTIVITIES        
Increase in short-term loans 10,394.3 350.7 18,968.9 3,138.7
Repayment of bonds (38,100.0) (1,285.4) (23,471.6)  
Repayment of long-term bank loans (31.4) (1.1) (8.5)  
Interest paid (3,482.7) (117.5) (3,302.4) (3,156.2)
Decrease in obligations under finance leases       (29.1)
Guarantee deposits received 950.9 32.1 6,354.7 754.9
Guarantee deposits refunded (3,823.2) (129.0) (523.3) (742.5)
Cash dividends (181,512.7) (6,123.9) (155,582.3) (116,683.5)
Proceeds from exercise of employee stock options       33.9
Donation from shareholders 20.9 0.7    
Decrease in non-controlling interests (113.7) (3.9) (235.7) (50.2)
Net cash used in financing activities (215,697.6) (7,277.3) (157,800.2) (116,734.0)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (21,317.8) (719.2) (8,029.8) 8,258.8
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 12,137.9 409.5 (21,435.1) 204,158.4
CASH AND CASH EQUIVALENTS INCLUDED IN NONCURRENT ASSETS HELD FOR SALE, BEGINNING OF YEAR       81.5
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 541,253.8 18,260.9 562,688.9 358,449.0
CASH AND CASH EQUIVALENTS, END OF YEAR 553,391.7 18,670.4 541,253.8 $ 562,688.9
Land use right and others [member]        
CASH FLOWS FROM INVESTING ACTIVITIES        
Proceeds from government grants 1.8 0.1 798.5  
Property, plant and equipment [member]        
CASH FLOWS FROM INVESTING ACTIVITIES        
Proceeds from government grants $ 2,629.8 $ 88.7 $ 738.6