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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 $ 44,986 $ 1,470 $ 48,009 $ 49,413
Adjustments to reconcile income before income tax to net cash provided by operating activities:        
Depreciation 27,482 898 28,164 29,106
Amortization 4,386 143 3,766 3,379
Amortization of incremental costs of obtaining contracts 1,941 63 0 0
Expected credit loss 920 30 0 0
Provision for doubtful accounts 0 0 643 941
Interest expenses 18 1 22 20
Interest income (197) (7) (205) (189)
Dividend income (396) (13) (328) (391)
Compensation cost of share-based payment transactions 17 1 22 17
Share of profits of associates and joint ventures accounted for using equity method (509) (17) (419) (515)
Loss (gain) on disposal of property, plant and equipment (142) (5) 107 48
Property, plant and equipment transferred to expenses 0 0 3 0
Loss on disposal of intangible assets 0 0 0 0
Gain on disposal of financial instruments (6) 0 (3) 0
Loss on disposal of investments accounted for using equity method 0 0 0 2
Impairment loss on available-for-sale financial assets 0 0 0 577
Provision for inventory and obsolescence 365 12 52 192
Impairment loss on property, plant and equipment 0 0 0 596
Reversal of impairment loss on investment properties (19) (1) (11) (148)
Impairment loss on intangible assets 51 2 9 0
Valuation loss (gain) on financial assets and liabilities at fair value through profit or loss, net 21 1 (1) 1
Loss (gain) on foreign exchange, net (17) (1) 83 (80)
Changes in operating assets and liabilities:        
Financial assets held for trading 0 0 0 0
Financial assets mandatorily measured at fair value through profit or loss 63 2 0 0
Contract assets 2,751 90 0 0
Trade notes and accounts receivable 1,354 44 (1,191) (4,613)
Receivables from related parties 25 1 (36) 28
Inventories (6,778) (221) (1,469) 1,166
Prepayments 418 14 458 62
Other current monetary assets (173) (6) (81) (242)
Other current assets (261) (9) (61) 214
Incremental cost of obtaining a contract (802) (26) 0 0
Contract liabilities 2,653 87 0 0
Trade notes and accounts payable 1,065 35 587 2,497
Payables to related parties 234 8 (78) 151
Other payables (1,089) (36) (691) (76)
Provisions 27 1 82 (63)
Advance receipts 0 0 (728) 504
Other operating liabilities 422 14 (76) 7
Deferred revenue 0 0 66 (70)
Net defined benefit plans (1,535) (50) 49 (8,539)
Cash generated from operations 77,275 2,525 76,744 73,995
Interest paid (18) (1) (22) (20)
Income tax paid (10,891) (356) (5,790) (9,023)
Net cash provided by operating activities 66,366 2,168 70,932 64,952
CASH FLOWS FROM INVESTING ACTIVITIES        
Acquisition of financial assets at fair value through other comprehensive income (290) (10) 0 0
Proceeds from return of financial assets at fair value through other comprehensive income 7 0 0 0
Acquisition of available-for-sale financial assets 0 0 (400) (53)
Proceeds from disposal of available-for-sale financial assets 0 0 9 39
Proceeds from capital reduction of available-for-sale financial assets 0 0 12 37
Acquisition of time deposits and negotiable certificate of deposit with maturities of more than three months (9,720) (318) (6,231) (4,119)
Proceeds from disposal of time deposits and negotiable certificate of deposit with maturities of more than three months 5,655 185 5,650 2,834
Proceeds from disposal of held-to-maturity financial assets 0 0 2,140 1,875
Acquisition of investments accounted for using equity method (205) (7) 0 (30)
Proceeds from disposal of investments accounted for using equity method 3 0 0 182
Proceeds from capital reduction of investments accounted for using equity method 19 1 0 0
Acquisition of property, plant and equipment (28,550) (933) (26,875) (23,517)
Proceeds from disposal of property, plant and equipment 264 9 159 44
Acquisition of intangible assets (498) (16) (11,305) (282)
Acquisition of investment properties (6) 0 0 0
Increase in other noncurrent assets (80) (3) (788) 63
Interest received 187 6 233 198
Cash dividends received 600 20 675 1,066
Net cash used in investing activities (32,614) (1,066) (36,721) (21,663)
CASH FLOWS FROM FINANCING ACTIVITIES        
Proceeds from short-term loans 360 12 6,952 1,415
Repayment of short-term loans (330) (11) (7,020) (1,387)
Repayment of long-term loans 0 0 0 (150)
Increase (decrease) in customers’ deposits 31 1 (111) (294)
Increase (decrease) in other noncurrent liabilities 84 3 (37) (104)
Cash dividends paid (37,205) (1,215) (38,336) (42,551)
Partial disposal of interests in subsidiaries without losing control 1,175 38 106 83
Cash dividends distributed to noncontrolling interests (958) (31) (942) (710)
Change in other noncontrolling interests 1,806 59 2,777 1,180
Unclaimed dividend 2 0 3 0
Net cash used in financing activities (35,035) (1,144) (36,608) (42,518)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 103 3 122 58
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (1,180) (39) (2,275) 829
CASH AND CASH EQUIVALENTS, BEGINNING OF THE YEAR 28,825 942 31,100 30,271
CASH AND CASH EQUIVALENTS, END OF THE YEAR $ 27,645 $ 903 $ 28,825 $ 31,100