https://learn.microsoft.com/en-us/dotnet/api/microsoft.xrm.sdk.metadata.doubleattributemetadata.maxsupportedvalue?view=dataverse-sdk-latest
DoubleAttributeMetadata.MaxSupportedValue Field (Microsoft.Xrm.Sdk.Metadata) | Microsoft Learn
The maximum supported value is 100 billion.
fieldmicrosoftxrmsdkmetadata