Should I capitalize "Billion" in a bulleted list?

I have list of values in a report used to highlight demographic information. For dollar values, should I capitalize the word "Billion", or leave it lower case?

Here's a sample:

Appraised Value: $4.8 Billion

• Agriculture $0.1 Billion
• Residential $3.3 Billion
• Commercial $1.1 Billion
• Other $0.3 Billion

In general text, I would use lower case. In a title, I would use capital. Which do you consider this to be?

Why would you put it in title case? What makes the word billion a proper noun? Those are rhetorical questions. Your bullets should look like this:

Agriculture: $0.1 billion

Residential: $3.3 billion

Commercial: $1.1 billion

Other: $0.3 billion