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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 $ 48,009 $ 1,620 $ 49,413 $ 51,953
Adjustments to reconcile income before income tax to net cash provided by operating activities:        
Depreciation 28,164 950 29,106 30,368
Amortization 3,766 127 3,379 3,080
Provision for doubtful accounts 643 22 941 519
Interest expenses 22 1 20 33
Interest income (205) (7) (189) (306)
Dividend income (328) (11) (391) (218)
Compensation cost of share-based payment transactions 22 1 17 36
Share of profits of associates and joint ventures accounted for using equity method (419) (14) (515) (897)
Loss on disposal of property, plant and equipment 107 4 48 109
Property, plant and equipment transferred to expenses 3 0 0 0
Loss on disposal of intangible assets 0 0 0 0
Gain on disposal of financial instruments (3) 0 0 0
Loss (gain) on disposal of investments accounted for using equity method 0 0 2 (4)
Impairment loss on available-for-sale financial assets 0 0 577 107
Impairment loss on investments accounted for using equity method 0 0 0 8
Provision for inventory and obsolescence 52 2 192 198
Impairment loss on property, plant and equipment 0 0 596 138
Reversal of impairment loss on investment properties (11) 0 (148) (142)
Impairment loss on intangible assets 9 0 0 0
Valuation loss (gain) on financial assets and liabilities at fair value through profit or loss, net (1) 0 1 0
Loss (gain) on foreign exchange, net 83 3 (80) 54
Changes in operating assets and liabilities:        
Financial assets held for trading 0 0 0 1
Trade notes and accounts receivable (1,191) (40) (4,613) (1,172)
Receivables from related parties (36) (1) 28 39
Inventories (1,469) (50) 1,166 (1,852)
Prepayments 458 15 62 (327)
Other current monetary assets (81) (3) (242) (357)
Other current assets (61) (2) 214 889
Trade notes and accounts payable 587 20 2,497 (2,223)
Payables to related parties (78) (3) 151 203
Other payables (691) (24) (76) 1,644
Provisions 82 3 (63) (24)
Advance receipts (728) (25) 504 1,134
Other current liabilities (76) (3) 7 (112)
Deferred revenue 66 2 (70) 218
Net defined benefit plans 49 2 (8,539) 439
Cash generated from operations 76,744 2,589 73,995 83,536
Interest paid (22) (1) (20) (33)
Income tax paid (5,790) (195) (9,023) (7,178)
Net cash provided by operating activities 70,932 2,393 64,952 76,325
CASH FLOWS FROM INVESTING ACTIVITIES        
Acquisition of available-for-sale financial assets (400) (13) (53) (29)
Proceeds from disposal of available-for-sale financial assets 9 0 39 2
Proceeds from capital reduction of available-for-sale financial assets 12 0 37 44
Acquisition of time deposits and negotiable certificate of deposit with maturities of more than three months (6,231) (210) (4,119) (11,494)
Proceeds from disposal of time deposits and negotiable certificate of deposit with maturities of more than three months 5,650 191 2,834 11,824
Acquisition of held-to-maturity financial assets 0 0 0 (1,002)
Proceeds from disposal of held-to-maturity financial assets 2,140 72 1,875 4,450
Acquisition of investments accounted for using equity method 0 0 (30) (6)
Proceeds from disposal of investments accounted for using equity method 0 0 182 16
Net cash outflow on acquisition of subsidiaries 0 0 0 (114)
Acquisition of property, plant and equipment (26,875) (907) (23,517) (25,084)
Proceeds from disposal of property, plant and equipment 159 5 44 4
Acquisition of intangible assets (11,305) (381) (282) (10,380)
Acquisition of investment properties 0 0 0 0
Decrease (increase) in other noncurrent assets (788) (27) 63 72
Interest received 233 8 198 337
Cash dividends received 675 23 1,066 907
Net cash used in investing activities (36,721) (1,239) (21,663) (30,453)
CASH FLOWS FROM FINANCING ACTIVITIES        
Proceeds from short-term loans 6,952 235 1,415 2,750
Repayment of short-term loans (7,020) (237) (1,387) (3,258)
Repayment of long-term loans 0 0 (150) (190)
Decrease in customers’ deposits (111) (4) (294) (37)
Increase (decrease) in other noncurrent liabilities (37) (1) (104) 12
Cash dividends paid (38,336) (1,293) (42,551) (37,673)
Partial disposal of interests in subsidiaries without losing control 106 4 83 45
Cash dividends distributed to noncontrolling interests (942) (32) (710) (350)
Change in other noncontrolling interests 2,777 94 1,180 (485)
Unclaimed dividend 3 0 0 0
Net cash used in financing activities (36,608) (1,234) (42,518) (39,186)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 122 4 58 25
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (2,275) (76) 829 6,711
CASH AND CASH EQUIVALENTS, BEGINNING OF THE YEAR 31,100 1,049 30,271 23,560
CASH AND CASH EQUIVALENTS, END OF THE YEAR $ 28,825 $ 973 $ 31,100 $ 30,271