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Investments Accounted for Using Equity Method - Investments in Joint Ventures (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 TWD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 TWD ($)	Dec. 31, 2015 TWD ($)
Disclosure of joint ventures [Line Items]
Investments in joint ventures	$ 0		$ 3
Percentage of ownership in joint ventures	0.00%	0.00%	0.00%
Percentage of voting rights in joint ventures	0.00%	0.00%	0.00%
The Company’s share of loss	$ 419	$ 14	$ 515	$ 897
Huada Digital Corporation ("HDD") [Member]
Disclosure of joint ventures [Line Items]
Investments in joint ventures	$ 0		$ 0
Percentage of ownership in joint ventures	0.00%	0.00%	50.00%
Percentage of voting rights in joint ventures	0.00%	0.00%	50.00%
Chunghwa Benefit One Co., Ltd. ("CBO") [Member]
Disclosure of joint ventures [Line Items]
Investments in joint ventures	$ 0		$ 3
Percentage of ownership in joint ventures	0.00%	0.00%	50.00%
Percentage of voting rights in joint ventures	0.00%	0.00%	50.00%
Joint ventures [Member]
Disclosure of joint ventures [Line Items]
The Company’s share of loss	$ (1)		$ (42)	(29)
The Company’s share of other comprehensive (loss) income	0		0	0
The Company’s share of total comprehensive loss	$ (1)		$ (42)	$ (29)

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The amount of investments in joint ventures. [Refer: Joint ventures [member]]

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The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

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The proportion of the voting rights in a joint venture held by the entity. [Refer: Joint ventures [member]]

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The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Other comprehensive income]

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The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

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The entity's share of the total comprehensive income of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Joint ventures [member]; Investments accounted for using equity method]

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