| Document and Entity Information | Dec. 10, 2019 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001730168 |
| Document Type | 8-K |
| Document Period End Date | Dec. 10, 2019 |
| Entity Registrant Name | BROADCOM INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38449 |
| Entity Tax Identification Number | 35-2617337 |
| Entity Address, Address Line One | 1320 Ridder Park Drive |
| Entity Address, City or Town | San Jose |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95131 |
| City Area Code | (408) |
| Local Phone Number | 433-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, $0.001 par value |
| Trading Symbol | AVGO |
| Security Exchange Name | NASDAQ |
| Series A Preferred Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Mandatory Convertible Preferred Stock, Series A, $0.01 par value |
| Trading Symbol | AVGOP |
| Security Exchange Name | NASDAQ |
