Outstanding Insurance Exposure Outstanding Insurance Exposure - Schedule of Non-Financial Guaranty Exposure (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of Insured Financial Obligations [Line Items]
Residual value insurance policies exposure downgraded	$ 1,454	$ 1,444
Net Exposure	1,151	1,141
Life Insurance Transaction [Member]
Schedule of Insured Financial Obligations [Line Items]
Residual value insurance policies exposure downgraded	1,063	1,046
Net Exposure	915	898
Aircraft residual value insurance policies [Member]
Schedule of Insured Financial Obligations [Line Items]
Residual value insurance policies exposure downgraded	391	398
Net Exposure	$ 236	$ 243