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Loans and Bonds Payable (Tables)

12 Months Ended

Dec. 31, 2020

Short-term loans [member]

Statement [LineItems]

Summary of Loans and Bonds Payable

		December 31, 2019				December 31, 2020
		NT$				NT$
		(In Millions)				(In Millions)
Unsecured loans
Amount		$	118,522.3			$	88,559.0
Loan content
US$ (in millions)		$	2,370.0			$	200.0
EUR (in millions)			1,410.0				2,398.0
Annual interest rate			0.01%-2.22	%			(0.54)%-0.33	%
Maturity date			Due by May 2020				Due by February 2021

Bonds payable [member]

Statement [LineItems]

Summary of Loans and Bonds Payable

		December 31, 2019				December 31, 2020
		NT$				NT$
		(In Millions)				(In Millions)
Domestic unsecured bonds		$	56,900.0			$	173,197.0
Overseas unsecured bonds			—				84,291.0
Less: Discounts on bonds payable			—				(782.9	)
Less: Current portion			(31,800.0	)			(2,600.0	)
		$	25,100.0			$	254,105.1

Bonds payable [member] | Taiwan [member]

Statement [LineItems]

Summary of Loans and Bonds Payable

The major terms of domestic unsecured bonds are as follows:

Issuance		Tranche				Issuance Period		Total Amount NT$ (In Millions)				Coupon Rate				Repayment and Interest Payment
NT$ unsecured bonds
100-2			B			January 2012 to January 2019		$	7,000.0				1.46	%		Bullet repayment; interest payable annually
101-1			B			August 2012 to August 2019			9,000.0				1.40	%		The same as above

Issuance		Tranche		Issuance Period		Total Amount NT$ (In Millions)				Coupon Rate				Repayment and Interest Payment
101-2		B		September 2012 to September 2019		$	9,000.0				1.39	%		Bullet repayment; interest payable annually
101-3		—		October 2012 to October 2022			4,400.0				1.53	%		The same as above
101-4		B		January 2013 to January 2020			10,000.0				1.35	%		The same as above
		C		January 2013 to January 2023			3,000.0				1.49	%		The same as above
102-1		B		February 2013 to February 2020			11,600.0				1.38	%		The same as above
		C		February 2013 to February 2023			3,600.0				1.50	%		The same as above
102-2		A		July 2013 to July 2020			10,200.0				1.50	%		The same as above
		B		July 2013 to July 2023			3,500.0				1.70	%		The same as above
102-3		B		August 2013 to August 2019			8,500.0				1.52	%		The same as above
102-4		C		September 2013 to March 2019			1,400.0				1.60	%		Bullet repayment; interest payable annually (interest for the six months prior to maturity will accrue on the basis of actual days and be repayable at maturity)
		D		September 2013 to March 2021			2,600.0				1.85	%		The same as above
		E		September 2013 to March 2023			5,400.0				2.05	%		The same as above
		F		September 2013 to September 2023			2,600.0				2.10	%		Bullet repayment; interest payable annually
109-1		A		March 2020 to March 2025			3,000.0				0.58	%		The same as above
		B		March 2020 to March 2027			10,500.0				0.62	%		The same as above
		C		March 2020 to March 2030			10,500.0				0.64	%		The same as above
109-2		A		April 2020 to April 2025			5,900.0				0.52	%		The same as above
		B		April 2020 to April 2027			10,400.0				0.58	%		The same as above
		C		April 2020 to April 2030			5,300.0				0.60	%		The same as above
109-3		A		May 2020 to May 2025			4,500.0				0.55	%		The same as above
		B		May 2020 to May 2027			7,500.0				0.60	%		The same as above

Issuance		Tranche		Issuance Period		Total Amount NT$ (In Millions)				Coupon Rate				Repayment and Interest Payment
109-3		C		May 2020 to May 2030		$	2,400.0				0.64	%		Bullet repayment; interest payable annually
109-4		A		July 2020 to July 2025			5,700.0				0.58	%		Two equal installments in last two years; interest payable annually
		B		July 2020 to July 2027			6,300.0				0.65	%		The same as above
		C		July 2020 to July 2030			1,900.0				0.67	%		The same as above
109-5		A		September 2020 to September 2025			4,800.0				0.50	%		The same as above
		B		September 2020 to September 2027			8,000.0				0.58	%		The same as above
		C		September 2020 to September 2030			2,800.0				0.60	%		The same as above
109-6 (green bond)		A		December 2020 to December 2025			1,600.0				0.40	%		The same as above
		B		December 2020 to December 2027			5,600.0				0.44	%		The same as above
		C		December 2020 to December 2030			4,800.0				0.48	%		The same as above
109-7		A		December 2020 to December 2025			1,900.0				0.36	%		The same as above
		B		December 2020 to December 2027			10,200.0				0.41	%		The same as above
		C		December 2020 to December 2030			6,400.0				0.45	%		The same as above
														(Concluded)
Issuance		Tranche		Issuance Period		Total Amount US$ (In Millions)				Coupon Rate				Repayment and Interest Payment
US$ unsecured bonds
109-1		—		September 2020 to September 2060		US$	1,000.0				2.70	%		Bullet repayment (callable on the 5th anniversary of the issue date and every anniversary thereafter); interest payable annually

Bonds payable [member] | Overseas [member]

Statement [LineItems]

Summary of Loans and Bonds Payable

The major terms of overseas unsecured bonds are as follows:

Issuance Period		Total Amount US$ (In Millions)				Coupon Rate		Repayment and Interest Payment
September 2020 to September 2025		US$	1,000.0			0.75%		Bullet repayment (callable at any time, in whole or in part, at the relevant redemption price according to relevant agreements); interest payable semi-annually
September 2020 to September 2027			750.0			1.00%		The same as above
September 2020 to September 2030			1,250.0			1.375%		The same as above

Long-term bank loans [member]

Statement [LineItems]

Summary of Loans and Bonds Payable

		December 31, 2020
		NT$ (In Millions)
Unsecured loans		$	2,000.0
Less: Discounts on government grants			(32.4	)
		$	1,967.6
Loan content
Annual interest rate			0.4%
Maturity date			Due by September 2025

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