Outstanding Insurance Exposure - Schedule of Non-Financial Guaranty Exposure (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Life Insurance Transactions [Member]
Schedule of Insured Financial Obligations [Line Items]
Gross Exposure	$ 1,046	$ 880
Net debt service outstanding	898	763
Aircraft residual value insurance policies [Member]
Schedule of Insured Financial Obligations [Line Items]
Gross Exposure	398	340
Net debt service outstanding	243	$ 218
Maximum [Member] | Life Insurance Transactions [Member]
Schedule of Insured Financial Obligations [Line Items]
Net debt service outstanding	$ 1,000