Investments (Leveraged and Direct Financing Leases - Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessor, Lease, Description [Line Items]
Loan and Leases Receivable Other Information	The payment periods for leveraged leases generally range from one to 11 years but in certain circumstances can be over 11 years, while the payment periods for direct financing leases generally range from one to 25 years but in certain circumstances can be over 25 years.
Leveraged Leases, Net Investment in Leveraged Leases Disclosure, Deferred Taxes Arising from Leveraged Leases	$ 287	$ 467
Deferral rental payment for leveraged and direct finance leases	15
Rental abatements for leases due to Covid-19	$ 3
Loans and Leases Receivable, Ratio of Performing Loans to All Loans	100.00%	100.00%
Leveraged Leases
Lessor, Lease, Description [Line Items]
Loan and Leases Receivable, Ratio of Performing Leases	96.00%	94.00%