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Consolidated Statements of Changes in Equity shares in Millions, $ in Millions, $ in Millions | TWD ($) | USD ($) | Capital Stock - Common Stock [member] TWD ($) shares | Capital Stock - Common Stock [member] USD ($) shares | Capital Surplus [member] TWD ($) | Capital Surplus [member] USD ($) | Retained Earnings - Legal Capital Reserve [Member] TWD ($) | Retained Earnings - Legal Capital Reserve [Member] USD ($) | Retained Earnings - Unappropriated Earnings [Member] TWD ($) | Retained Earnings - Unappropriated Earnings [Member] USD ($) | Retained Earnings [member] TWD ($) | Retained Earnings [member] USD ($) | Others - Foreign Currency Translation Reserve [member] TWD ($) | Others - Foreign Currency Translation Reserve [member] USD ($) | Others - Unrealized Gain/Loss from Available-for-sale Financial Assets [member] TWD ($) | Others - Unrealized Gain/Loss from Available-for-sale Financial Assets [member] USD ($) | Others - Cash Flow Hedges Reserve [member] TWD ($) | Others - Cash Flow Hedges Reserve [member] USD ($) | Others - Unearned Stock-Based Employee Compensation [member] TWD ($) | Others - Unearned Stock-Based Employee Compensation [member] USD ($) | Others - Total [Member] TWD ($) | Others - Total [Member] USD ($) | Total Equity Attributable to Shareholders of the Parent [Member] TWD ($) | Total Equity Attributable to Shareholders of the Parent [Member] USD ($) | Non-controlling Interests [Member] TWD ($) | Non-controlling Interests [Member] USD ($)
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Beginning balance at Dec. 31, 2014 | $ 1,022,360.7 |  | $ 259,296.6 |  | $ 55,963.4 |  | $ 151,250.7 |  | $ 529,973.5 |  | $ 681,224.2 |  | $ 4,502.1 |  | $ 21,247.5 |  | $ (0.3) |  |  |  | $ 25,749.3 |  | $ 1,022,233.5 |  | $ 127.2 |
Beginning balance, shares at Dec. 31, 2014 | shares |  |  | 25,929.6 | 25,929.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal capital reserve |  |  |  |  |  |  | 26,389.9 |  | (26,389.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends to shareholders-NT$4.5, NT$6 and NT$7 per share for the years ended December 31, 2015, 2016 and 2017 | (116,683.5) |  |  |  |  |  |  |  | (116,683.5) |  | (116,683.5) |  |  |  |  |  |  |  |  |  |  |  | (116,683.5) |  |  |
Total | (116,683.5) |  |  |  |  |  | 26,389.9 |  | (143,073.4) |  | (116,683.5) |  |  |  |  |  |  |  |  |  |  |  | (116,683.5) |  |  |
Net income(loss) | 302,832.9 |  |  |  |  |  |  |  | 302,850.9 |  | 302,850.9 |  |  |  |  |  |  |  |  |  |  |  | 302,850.9 |  | (18.0) |
Other comprehensive income (loss), net of income tax | (14,714.2) |  |  |  |  |  |  |  | (730.9) |  | (730.9) |  | 6,537.8 |  | (20,512.7) |  | (0.3) |  |  |  | (13,975.2) |  | (14,706.1) |  | (8.1) |
Total comprehensive income (loss) | 288,118.7 |  |  |  |  |  |  |  | 302,120.0 |  | 302,120.0 |  | 6,537.8 |  | (20,512.7) |  | (0.3) |  |  |  | (13,975.2) |  | 288,144.8 |  | (26.1) |
Issuance of stock from exercise of employee stock options | 138.2 |  | $ 7.2 |  | 131.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 138.2 |  |  |
Issuance of stock from exercise of employee stock options, shares | shares |  |  | 0.7 | 0.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments accounted for using equity method | (47.9) |  |  |  | (47.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (47.9) |  |  |
Adjustments to share of changes in equities of associates and joint venture | 253.0 |  |  |  | 257.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 257.2 |  | (4.2) |
From differences between equity purchase price and carrying amount arising from actual acquisition or disposal of subsidiaries |  |  |  |  |  |  |  |  | (31.1) |  | (31.1) |  |  |  |  |  |  |  |  |  |  |  | (31.1) |  | 31.1 |
From share of changes in equities of subsidiaries |  |  |  |  | (3.5) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.5) |  | 3.5 |
Decrease in non-controlling interests | (50.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (50.2) |
Effect of acquisition of subsidiary | 923.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 923.7 |
Effect of disposal of subsidiary | (42.6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (42.6) |
Ending balance at Dec. 31, 2015 | 1,194,970.1 |  | $ 259,303.8 |  | 56,300.2 |  | 177,640.6 |  | 688,989.0 |  | 866,629.6 |  | 11,039.9 |  | 734.8 |  | (0.6) |  |  |  | 11,774.1 |  | 1,194,007.7 |  | 962.4 |
Ending balance, shares at Dec. 31, 2015 | shares |  |  | 25,930.3 | 25,930.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal capital reserve |  |  |  |  |  |  | 30,657.4 |  | (30,657.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends to shareholders-NT$4.5, NT$6 and NT$7 per share for the years ended December 31, 2015, 2016 and 2017 | (155,582.3) |  |  |  |  |  |  |  | (155,582.3) |  | (155,582.3) |  |  |  |  |  |  |  |  |  |  |  | (155,582.3) |  |  |
Total | (155,582.3) |  |  |  |  |  | 30,657.4 |  | (186,239.7) |  | (155,582.3) |  |  |  |  |  |  |  |  |  |  |  | (155,582.3) |  |  |
Net income(loss) | 331,797.3 |  |  |  |  |  |  |  | 331,713.7 |  | 331,713.7 |  |  |  |  |  |  |  |  |  |  |  | 331,713.7 |  | 83.6 |
Other comprehensive income (loss), net of income tax | (11,067.2) |  |  |  |  |  |  |  | (950.3) |  | (950.3) |  | (9,378.7) |  | (732.2) |  | 0.7 |  |  |  | (10,110.2) |  | (11,060.5) |  | (6.7) |
Total comprehensive income (loss) | 320,730.1 |  |  |  |  |  |  |  | 330,763.4 |  | 330,763.4 |  | (9,378.7) |  | (732.2) |  | 0.7 |  |  |  | (10,110.2) |  | 320,653.2 |  | 76.9 |
Disposal of investments accounted for using equity method | (56.1) |  |  |  | (56.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (56.1) |  |  |
Adjustments to share of changes in equities of associates and joint venture | 21.2 |  |  |  | 21.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.2 |  |  |
From share of changes in equities of subsidiaries |  |  |  |  | 7.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.0 |  | (7.0) |
Decrease in non-controlling interests | (235.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (235.2) |
Effect of disposal of subsidiary | (2.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2.0) |
Ending balance at Dec. 31, 2016 | 1,359,845.8 |  | $ 259,303.8 |  | 56,272.3 |  | 208,298.0 |  | 833,512.7 |  | 1,041,810.7 |  | 1,661.2 |  | 2.6 |  | 0.1 |  |  |  | 1,663.9 |  | 1,359,050.7 |  | 795.1 |
Ending balance, shares at Dec. 31, 2016 | shares |  |  | 25,930.3 | 25,930.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal capital reserve |  |  |  |  |  |  | 33,424.7 |  | (33,424.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends to shareholders-NT$4.5, NT$6 and NT$7 per share for the years ended December 31, 2015, 2016 and 2017 | (181,512.7) |  |  |  |  |  |  |  | (181,512.7) |  | (181,512.7) |  |  |  |  |  |  |  |  |  |  |  | (181,512.7) |  |  |
Total | (181,512.7) |  |  |  |  |  | 33,424.7 |  | (214,937.4) |  | (181,512.7) |  |  |  |  |  |  |  |  |  |  |  | (181,512.7) |  |  |
Net income(loss) | 345,039.0 | $ 11,641.0 |  |  |  |  |  |  | 344,998.3 |  | 344,998.3 |  |  |  |  |  |  |  |  |  |  |  | 344,998.3 |  | 40.7 |
Other comprehensive income (loss), net of income tax | (28,821.6) | (972.4) |  |  |  |  |  |  | (245.0) |  | (245.0) |  | (28,358.9) |  | (216.7) |  | 4.1 |  |  |  | (28,571.5) |  | (28,816.5) |  | (5.1) |
Total comprehensive income (loss) | 316,217.4 | 10,668.6 |  |  |  |  |  |  | 344,753.3 |  | 344,753.3 |  | (28,358.9) |  | (216.7) |  | 4.1 |  |  |  | (28,571.5) |  | 316,181.8 |  | 35.6 |
Adjustments to share of changes in equities of associates and joint venture | (3.2) |  |  |  | 7.1 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (10.3) |  | (10.3) |  | (3.2) |  |  |
From share of changes in equities of subsidiaries |  |  |  |  | 11.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.0 |  | (11.0) |
Donation from shareholders | 20.9 |  |  |  | 19.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19.2 |  | 1.7 |
Decrease in non-controlling interests | (113.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (113.7) |
Effect of disposal of subsidiary | (8.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8.0) |
Ending balance at Dec. 31, 2017 | $ 1,494,446.5 | $ 50,419.9 | $ 259,303.8 | $ 8,748.4 | $ 56,309.6 | $ 1,899.8 | $ 241,722.7 | $ 8,155.3 | $ 963,328.6 | $ 32,501.0 | $ 1,205,051.3 | $ 40,656.3 | $ (26,697.7) | $ (900.7) | $ (214.1) | $ (7.2) | $ 4.2 | $ 0.1 | $ (10.3) | $ (0.4) | $ (26,917.9) | $ (908.2) | $ 1,493,746.8 | $ 50,396.3 | $ 699.7 | $ 23.6
Ending balance, shares at Dec. 31, 2017 | shares |  |  | 25,930.3 | 25,930.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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