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PENSION AND OTHER POST-EMPLOYMENT BENEFITS (Details)
Rp in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
IDR (Rp)
Dec. 31, 2016
IDR (Rp)
Dec. 31, 2015
IDR (Rp)
Dec. 31, 2017
IDR (Rp)
Disclosure of defined benefit plans [line items]          
Prepaid pension benefit cost     Rp 199,000    
Pension and other post-employment benefit obligations $ 751   6,126,000   Rp 10,195,000
Employee benefit cost   Rp 2,080,000 1,361,000 Rp 759,000  
Amounts recognized in OCI   (2,869,000) (2,266,000) 309,000  
Deferred tax effect at the applicable tax rates   494,000 208,000 59,000  
Defined benefit plan actuarial gain (loss) - net of tax $ (175) (2,375,000) (2,058,000) 368,000  
Pension benefit cost          
Disclosure of defined benefit plans [line items]          
Prepaid pension benefit cost     199,000    
Pension and other post-employment benefit obligations     3,700,000   6,839,000
Employee benefit cost   1,700,000 1,068,000 443,000  
Pension benefit cost | Patrakom          
Disclosure of defined benefit plans [line items]          
Pension and other post-employment benefit obligations     0   0
Employee benefit cost   0 0    
Amounts recognized in OCI   0 0    
Pension benefit cost | Telkomsel          
Disclosure of defined benefit plans [line items]          
Pension and other post-employment benefit obligations     1,193,000   1,839,000
Employee benefit cost   247,000 181,000 179,000  
Amounts recognized in OCI   (530,000) (292,000) (172,000)  
Defined benefit plan actuarial gain (loss) - net of tax   (530,000) (292,000) (172,000)  
Pension benefit cost | MD Media          
Disclosure of defined benefit plans [line items]          
Prepaid pension benefit cost     1,000    
Pension and other post-employment benefit obligations         0
Employee benefit cost   0 0 1,000  
Amounts recognized in OCI   (2,000) (1,000) 1,000  
Pension benefit cost | Infomedia          
Disclosure of defined benefit plans [line items]          
Prepaid pension benefit cost     1,000    
Pension and other post-employment benefit obligations         0
Employee benefit cost   0 0 0  
Amounts recognized in OCI   (1,000) 0 0  
Additional pension benefit obligation          
Disclosure of defined benefit plans [line items]          
Defined benefit plan actuarial gain (loss) - net of tax   (419,000)      
Post-employment health care benefit cost          
Disclosure of defined benefit plans [line items]          
Pension and other post-employment benefit obligations     1,592,000   2,419,000
Employee benefit cost   276,000 163,000 216,000  
Amounts recognized in OCI   (551,000) (1,309,000) 540,000  
Defined benefit plan actuarial gain (loss) - net of tax   (551,000) (1,309,000) 540,000  
Other post-employment benefit cost          
Disclosure of defined benefit plans [line items]          
Pension and other post-employment benefit obligations     502,000   510,000
Employee benefit cost   42,000 48,000 47,000  
Amounts recognized in OCI   (40,000) (20,000) (11,000)  
Defined benefit plan actuarial gain (loss) - net of tax   (40,000) (20,000) (11,000)  
Other employee benefit cost          
Disclosure of defined benefit plans [line items]          
Pension and other post-employment benefit obligations     332,000   427,000
Employee benefit cost   62,000 82,000 53,000  
Amounts recognized in OCI   (72,000) (33,000) (48,000)  
The company | Funded pension          
Disclosure of defined benefit plans [line items]          
Prepaid pension benefit cost     197,000 1,329,000 (1,540,000)
Employee benefit cost   557,000 608,000 12,000  
Defined benefit plan actuarial gain (loss) - net of tax   (1,154,000) (492,000) 186,000  
The company | Defined pension benefit obligation          
Disclosure of defined benefit plans [line items]          
Pension and other post-employment benefit obligations         1,540,000
Employee benefit cost   557,000 608,000 12,000  
Amounts recognized in OCI   (1,154,000) (492,000) 186,000  
The company | Additional pension benefit obligation          
Disclosure of defined benefit plans [line items]          
Pension and other post-employment benefit obligations         1,076,000
Employee benefit cost   657,000      
Amounts recognized in OCI   (419,000)      
The company | Unfunded Pension          
Disclosure of defined benefit plans [line items]          
Pension and other post-employment benefit obligations     2,507,000   Rp 2,384,000
Employee benefit cost   239,000 279,000 251,000  
Amounts recognized in OCI   (100,000) (119,000) (187,000)  
Defined benefit plan actuarial gain (loss) - net of tax   Rp (100,000) Rp (119,000) Rp (187,000)