Investments (Leveraged and Direct Financing Leases - Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Investments, All Other Investments [Abstract]
Loans 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, Investment in Leveraged Leases, Net	$ 796	$ 816
Direct Financing Lease, Net Investment in Lease, after Allowance for Credit Loss	1,300	1,300
Leveraged and Direct Financing Leases, Allowance for credit loss	$ 42	$ 44