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Risk Management - Liquidity Risk (Details) $ in Millions, $ in Millions | 12 Months Ended |
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CLP ($) | Dec. 31, 2016 CLP ($)
Liabilities excluding non-delivery derivative transactions [member] |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | $ 32,731,457 | $ 30,516,910
Current accounts and other demand deposits |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 8,915,706 | 8,321,148
Transactions in the course of payment |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 29,871 | 25,702
Instrument sold under repurchase agreements and security lending |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 195,289 | 216,729
Savings accounts and time deposits |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 10,185,172 | 10,674,266
Full delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 4,526,899 | 2,789,412
Borrowings from financial institutions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 1,189,798 | 1,029,107
Other financial obligations |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 37,012 | 43,579
Debt issued in non-USD foreign currency |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 7,651,710 | 7,416,967
Non - delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | $ 3,611,590 | 3,427,982
Up to 1 month |  |  |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
Adjusted C46 All CCYs as % of Tier-1 Capital | 100.00% | 100.00% |
Adjusted C46 FCCY as % of Tier-1 Capital | 100.00% | 100.00% |
Up to 1 month | Liabilities excluding non-delivery derivative transactions [member] |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | $ 14,718,214 | 14,041,120
Up to 1 month | Current accounts and other demand deposits |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 8,915,706 | 8,321,148
Up to 1 month | Transactions in the course of payment |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 29,871 | 25,702
Up to 1 month | Instrument sold under repurchase agreements and security lending |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 194,539 | 209,908
Up to 1 month | Savings accounts and time deposits |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 5,097,833 | 4,954,428
Up to 1 month | Full delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 172,323 | 274,760
Up to 1 month | Borrowings from financial institutions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 260,272 | 150,396
Up to 1 month | Other financial obligations |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 295 | 557
Up to 1 month | Debt issued in non-USD foreign currency |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 47,375 | 104,221
Up to 1 month | Non - delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | $ 112,011 | 237,799
3 months |  |  |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
Adjusted C46 All CCYs as % of Tier-1 Capital | 200.00% | 200.00% |
Between 1 and 3 months | Liabilities excluding non-delivery derivative transactions [member] |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | $ 3,055,965 | 3,030,906
Between 1 and 3 months | Instrument sold under repurchase agreements and security lending |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 750 | 6,821
Between 1 and 3 months | Savings accounts and time deposits |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 2,509,694 | 2,478,148
Between 1 and 3 months | Full delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 136,729 | 225,173
Between 1 and 3 months | Borrowings from financial institutions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 242,515 | 231,890
Between 1 and 3 months | Other financial obligations |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 918 | 1,034
Between 1 and 3 months | Debt issued in non-USD foreign currency |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 165,359 | 87,840
Between 1 and 3 months | Non - delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 100,247 | 171,254
Between 3 and 12 months | Liabilities excluding non-delivery derivative transactions [member] |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 5,074,292 | 5,011,791
Between 3 and 12 months | Savings accounts and time deposits |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 2,555,579 | 3,083,258
Between 3 and 12 months | Full delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 1,166,598 | 872,004
Between 3 and 12 months | Borrowings from financial institutions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 613,159 | 526,149
Between 3 and 12 months | Other financial obligations |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 10,921 | 5,038
Between 3 and 12 months | Debt issued in non-USD foreign currency |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 728,035 | 525,342
Between 3 and 12 months | Non - delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 1,141,610 | 838,475
Due after 1 years but within 3 years | Liabilities excluding non-delivery derivative transactions [member] |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 2,335,751 | 2,227,381
Due after 1 years but within 3 years | Savings accounts and time deposits |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 21,536 | 157,591
Due after 1 years but within 3 years | Full delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 937,050 | 507,086
Due after 1 years but within 3 years | Borrowings from financial institutions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 73,852 | 120,672
Due after 1 years but within 3 years | Other financial obligations |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 24,038 | 18,173
Due after 1 years but within 3 years | Debt issued in non-USD foreign currency |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 1,279,275 | 1,423,859
Due after 1 years but within 3 years | Non - delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 816,847 | 887,297
Due after 3 years but within 5 years | Liabilities excluding non-delivery derivative transactions [member] |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 3,084,519 | 1,516,751
Due after 3 years but within 5 years | Savings accounts and time deposits |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 311 | 589
Due after 3 years but within 5 years | Full delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 1,582,890 | 292,965
Due after 3 years but within 5 years | Other financial obligations |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 686 | 18,401
Due after 3 years but within 5 years | Debt issued in non-USD foreign currency |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 1,500,632 | 1,204,796
Due after 3 years but within 5 years | Non - delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 325,199 | 196,923
Due after 5 years | Liabilities excluding non-delivery derivative transactions [member] |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 4,462,716 | 4,688,961
Due after 5 years | Savings accounts and time deposits |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 219 | 252
Due after 5 years | Full delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 531,309 | 617,424
Due after 5 years | Other financial obligations |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 154 | 376
Due after 5 years | Debt issued in non-USD foreign currency |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | 3,931,034 | 4,070,909
Due after 5 years | Non - delivery derivative transactions |  |  |
Contractual maturity of the financial liabilities |  |  |
Financial liabilities |  | $ 1,115,676 | $ 1,096,234
Maximum |  |  |
Liquidity Risk |  |  |
Period of time covered by internal funding liquidity report | 90 days | 90 days |
Cross currency funding value | $ 4,351 |  |
Financial ratios |  |  |
Liquid Assets/Net Funding less than 1y | 95.00% | 95.00% |
Liabilities greater than 1y/Assets greater than 1y | 74.00% | 74.00% |
Deposits/Loans | 63.00% | 63.00% |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
LCR | 1.07 | 1.07 |
NSFR | 0.99 | 0.99 |
Maximum | Up to 1 month |  |  |
Liquidity Risk |  |  |
Market Access Report value | $ 1,708 | $ 3,306 |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
Adjusted C46 All CCYs as % of Tier-1 Capital | 53.00% | 53.00% |
Adjusted C46 FCCY as % of Tier-1 Capital | 36.00% | 36.00% |
Maximum | 3 months |  |  |
Liquidity Risk |  |  |
Market Access Report value | $ 3,048 | $ 5,597 |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
Adjusted C46 All CCYs as % of Tier-1 Capital | 97.00% | 97.00% |
Minimum |  |  |
Liquidity Risk |  |  |
Period of time covered by internal funding liquidity report | 30 days | 30 days |
Cross currency funding value | $ 2,008 |  |
Financial ratios |  |  |
Liquid Assets/Net Funding less than 1y | 71.00% | 71.00% |
Liabilities greater than 1y/Assets greater than 1y | 72.00% | 72.00% |
Deposits/Loans | 60.00% | 60.00% |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
LCR | 0.69 | 0.69 |
NSFR | 0.94 | 0.94 |
Minimum | Up to 1 month |  |  |
Liquidity Risk |  |  |
Market Access Report value | $ 436 | $ 1,847 |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
Adjusted C46 All CCYs as % of Tier-1 Capital | 32.00% | 32.00% |
Adjusted C46 FCCY as % of Tier-1 Capital | 19.00% | 19.00% |
Minimum | 3 months |  |  |
Liquidity Risk |  |  |
Market Access Report value | $ 1,344 | $ 4,173 |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
Adjusted C46 All CCYs as % of Tier-1 Capital | 63.00% | 63.00% |
Average |  |  |
Liquidity Risk |  |  |
Cross currency funding value | $ 2,991 |  |
Financial ratios |  |  |
Liquid Assets/Net Funding less than 1y | 82.00% | 82.00% |
Liabilities greater than 1y/Assets greater than 1y | 73.00% | 73.00% |
Deposits/Loans | 62.00% | 62.00% |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
LCR | 0.88 | 0.88 |
NSFR | 0.97 | 0.97 |
Average | Up to 1 month |  |  |
Liquidity Risk |  |  |
Market Access Report value | $ 1,090 | $ 2,665 |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
Adjusted C46 All CCYs as % of Tier-1 Capital | 43.00% | 43.00% |
Adjusted C46 FCCY as % of Tier-1 Capital | 27.00% | 27.00% |
Average | 3 months |  |  |
Liquidity Risk |  |  |
Market Access Report value | $ 2,209 | $ 4,954 |
Currency's risk used as a percentage of Tier-1 Capital |  |  |
Adjusted C46 All CCYs as % of Tier-1 Capital | 78.00% | 78.00% |

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