Investments (Leveraged and Direct Financing Leases - Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Lessor, Lease, Description [Line Items]
Loan and Leases Receivable Other Information	The remaining life of the payment periods for leveraged leases generally range from one to 15 years but in certain circumstances can be over 25 years, while the remaining life of the payment periods for direct financing leases generally range from one to 25 years but in certain circumstances can be over 25 years.
Loans and Leases Receivable, Ratio of Performing Loans to All Loans	100.00%	100.00%
Leveraged Leases, Net Investment in Leveraged Leases Disclosure, Deferred Taxes Arising from Leveraged Leases	$ 467	$ 519
Minimum | Performing Financial Instruments [Member]
Lessor, Lease, Description [Line Items]
Loans and Leases Receivable, Ratio of Performing Loans to All Loans	94.00%	94.00%