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Cash Flow Information - Reconciliation of Net Cash Flow to Movement in Net Debt (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance ₺ (18,964,748)  
Cash inflows (27,447,776) ₺ (44,862,572)
Cash outflows 32,680,332 45,225,874
Other non-cashmovements (5,814,639) (6,626,809)
Borrowings, ending balance (19,546,831) (18,964,748)
As previously reported [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (18,964,748) (11,664,861)
Borrowings, ending balance   (18,964,748)
Increase (decrease) due to changes in accounting policy required by IFRSs [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (1,036,380)  
Borrowings, ending balance   (1,036,380)
Debt securities issued [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (5,210,562)  
Cash inflows (311,649) (2,188,313)
Cash outflows 563,241 432,140
Other non-cashmovements (1,006,820) (1,578,868)
Borrowings, ending balance (5,965,790) (5,210,562)
Debt securities issued [member] | As previously reported [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (5,210,562) (1,875,521)
Borrowings, ending balance   (5,210,562)
Loans Issued [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (13,531,027)  
Cash inflows (29,060,490) (43,728,604)
Cash outflows 32,003,647 44,339,377
Other non-cashmovements (2,219,012) (3,603,892)
Borrowings, ending balance (12,806,882) (13,531,027)
Loans Issued [member] | As previously reported [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (13,531,027) (10,537,908)
Borrowings, ending balance   (13,531,027)
Lease liabilities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (1,413,956)  
Cash outflows 1,215,320 1,164,879
Other non-cashmovements (1,334,419) (1,419,735)
Borrowings, ending balance (1,533,055) (1,413,956)
Lease liabilities [member] | As previously reported [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (1,413,956) (122,720)
Borrowings, ending balance   (1,413,956)
Lease liabilities [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (1,036,380)  
Borrowings, ending balance   (1,036,380)
Derivative Assets, net [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Derivative Assets Net 1,190,797  
Cash inflows 1,924,363 1,054,345
Cash outflows (1,101,876) (710,522)
Other non-cashmovements (1,254,388) (24,314)
Derivative Assets Net 758,896 1,190,797
Derivative Assets, net [member] | As previously reported [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Derivative Assets Net 1,190,797 871,288
Derivative Assets Net   1,190,797
Financial Liabilities Derivative Excluding Components [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (20,155,545)  
Cash inflows (29,372,139) (45,916,917)
Cash outflows 33,782,208 45,936,396
Other non-cashmovements (4,560,251) (6,602,495)
Borrowings, ending balance (20,305,727) (20,155,545)
Financial Liabilities Derivative Excluding Components [member] | As previously reported [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance (20,155,545) (12,536,149)
Borrowings, ending balance   (20,155,545)
Financial Liabilities Derivative Excluding Components [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Borrowings, beginning balance ₺ (1,036,380)  
Borrowings, ending balance   ₺ (1,036,380)