Debt - Asset Financing (Details) - Unsecured Debt - Finance leases, asset financing and other	12 Months Ended
	Dec. 31, 2019
Debt Instrument [Line Items]
Weighted average interest rate	1.06%
Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	0.85%
Term of debt instrument	5 years
Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	1.22%
Term of debt instrument	10 years