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Insurance Contracts and Private Pension - Summary of Income Related to Insurance and Private Pension (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | R$ 24,097 | R$ 26,876 | R$ 24,755
Group accident insurance [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 689 | 666 | 776
Individual accident [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 280 | 289 | 212
Commercial Multiple Peril [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 52 | 53 | 56
Internal Credit [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 78 | 64 | 63
Mandatory personal injury caused by motor vehicle [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions |  | 24 | 37
Serious or Terminal Diseases [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 188 | 172 | 166
Warranty extension - Assets [member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions |  |  | 112
Disability Savings Pension [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 291 | 319 | 295
Plan Generator of Benefits [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 2,193 | 2,084 | 1,955
Credit Life [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 879 | 621 | 570
Income from Uncertain Events [member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 235 | 177 | 146
Multiple Risks [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 209 | 151 | 162
Home insurance in market policies credit life [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 288 | 272 | 243
Traditional Insurance [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 122 | 129 | 142
VGBL [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 17,154 | 20,318 | 18,153
Group life [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | 937 | 990 | 1,234
Other Lines [Member] |  |  |
Disclosure of Types of Insurance Contracts [Line Items] |  |  |
Premiums and contributions | R$ 502 | R$ 547 | R$ 433

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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