XML 244 R228.htm IDEA: XBRL DOCUMENT v3.22.1
Fair Value Information - Schedule of Reconciliations for Financial Assets (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Reclassified to investment accounted for using equity method $ (64) $ 0 $ 0
Level 3 [Member]      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Beginning Balance 5,116 5,478 4,550
Acquisition 106   300
Disposal (5)    
Reclassified from investments accounted for using equity method   2  
Reclassified to investment accounted for using equity method (64)    
Recognized in profit or loss under “Other gains and losses” 251 (101) (39)
Recognized in other comprehensive income under “Unrealized gain or loss on financial assets at fair value through other comprehensive income” (1,294) (263) 676
Proceed from return of investments     (9)
Proceeds from return of capital due to capital reduction from investees (44)    
Ending Balance 4,066 5,116 5,478
Level 3 [Member] | Measured at Fair Value Through Profit or Loss [Member]      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Beginning Balance 677 778 517
Acquisition 25   300
Recognized in profit or loss under “Other gains and losses” 251 (101) (39)
Proceeds from return of capital due to capital reduction from investees (44)    
Ending Balance 909 677 778
Unrealized loss 232 (101) (39)
Level 3 [Member] | Measured at FVOCI [Member]      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Beginning Balance 4,439 4,700 4,033
Acquisition 81    
Disposal (5)    
Reclassified from investments accounted for using equity method   2  
Reclassified to investment accounted for using equity method (64)    
Recognized in other comprehensive income under “Unrealized gain or loss on financial assets at fair value through other comprehensive income” (1,294) (263) 676
Proceed from return of investments     (9)
Ending Balance $ 3,157 $ 4,439 $ 4,700