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Financial Assets at Amortized Cost-Securities - Summary of Amortized Cost of Financial Assets at Amortized Cost (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |  |
Amortized cost | R$ 994,759 | R$ 905,729 | R$ 902,289
Financial assets securities [Member] |  |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |  |
Amortized cost | 110,395 | 111,424 |
Fair Value | 106,749 | 106,242 |
Financial assets securities [Member] | Current [Member] |  |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |  |
Amortized cost | 14,661 | 26,057 |
Fair Value | 14,119 | 25,652 |
Financial assets securities [Member] | Current [Member] | Up to one year [Member] |  |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |  |
Amortized cost | 14,661 | 26,057 |
Fair Value | 14,119 | 25,652 |
Financial assets securities [Member] | Non-current [Member] |  |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |  |
Amortized cost | 95,734 | 85,367 |
Fair Value | 92,630 | 80,590 |
Financial assets securities [Member] | Non-current [Member] | From one to five years [Member] |  |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |  |
Amortized cost | 51,820 | 53,303 |
Fair Value | 50,970 | 50,650 |
Financial assets securities [Member] | Non-current [Member] | From five to ten years [Member] |  |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |  |
Amortized cost | 31,318 | 19,883 |
Fair Value | 29,802 | 18,571 |
Financial assets securities [Member] | Non-current [Member] | After ten years [Member] |  |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |  |
Amortized cost | 12,596 | 12,181 |
Fair Value | R$ 11,858 | R$ 11,369 |

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- Definition The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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