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Outstanding Exposure - Schedule of Non-Financial Guaranty Exposure (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Diversified real estate
Schedule of Insured Financial Obligations [Line Items]
Specialty business, gross par	$ 2,004	$ 1,569
Specialty business, net par	2,004	1,569
Insurance securitizations
Schedule of Insured Financial Obligations [Line Items]
Specialty business, gross par	1,449	1,370
Specialty business, net par	1,126	1,043
Pooled corporate obligations
Schedule of Insured Financial Obligations [Line Items]
Specialty business, gross par	868	488
Specialty business, net par	868	488
Aircraft residual value insurance
Schedule of Insured Financial Obligations [Line Items]
Specialty business, gross par	147	355
Specialty business, net par	87	$ 200
Maximum \| Insurance securitizations
Schedule of Insured Financial Obligations [Line Items]
Specialty business, gross par	1,500
Specialty business, net par	$ 1,200