Outstanding Exposure - Schedule of Non-Financial Guaranty Exposure (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule of Insured Financial Obligations [Line Items]
Gross Exposure	$ 1,605	$ 1,484
Net Exposure	1,071	928
Life insurance transactions
Schedule of Insured Financial Obligations [Line Items]
Gross Exposure	1,250	1,121
Net Exposure	871	720
Aircraft residual value insurance policies
Schedule of Insured Financial Obligations [Line Items]
Gross Exposure	355	363
Net Exposure	200	$ 208
Maximum | Life insurance transactions
Schedule of Insured Financial Obligations [Line Items]
Net Exposure	$ 1,100