Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income

The following tables detail the changes in the balances of each component of accumulated other comprehensive income for the affected periods:

	Year Ended December 31, 2023:										Year ended December 31, 2022:
	Unrealized Gains (Losses) on Available- for Sale Securities (1)		Amortization  of Postretirement Benefit (1)		Gain (Loss)  on Foreign  Currency Translation  (1)		Credit Risk Changes of Fair Value Option Liabilities  (1) (2)		Total		Unrealized Gains (Losses) on Available- for Sale Securities (1)		Amortization  of Postretirement Benefit (1)		Gain (Loss)  on Foreign  Currency Translation  (1)		Credit Risk Changes of Fair Value Option Liabilities  (1) (2)		Total
Beginning Balance	$	(71)	$	3	$	(184)	$	(1)	$	(253)	$	154	$	4	$	(100)	$	(1)	$	58
Other comprehensive income (loss) before reclassifications	31		3		40		—		74		(211)		—		(85)		—		(296)
Amounts reclassified from accumulated other comprehensive income (loss)	21		(1)		—		—		19		(14)		(1)		—		—		(15)
Net current period other comprehensive income (loss)	51		2		40		—		93		(225)		(1)		(85)		—		(310)
Ending balance	$	(20)	$	5	$	(144)	$	(1)	$	(160)	$	(71)	$	3	$	(184)	$	(1)	$	(253)

(1)All amounts are net of tax and noncontrolling interest. Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income.

(2)Represents the changes in fair value attributable to instrument-specific credit risk of liabilities for which the fair value option is elected.

Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income

The following table details the significant amounts reclassified from each component of accumulated other comprehensive income, shown in the above rollforward tables, for the affected periods:

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income				Affected Line Item in the Consolidated Statement of Total Comprehensive Income
	Year Ended December 31,
	2023		2022
Unrealized Gains (Losses) on Available-for-Sale Securities (1)
	$	22	$	(17)	Net realized investment gains (losses)
	(2)		3		Provision for income taxes
	$	21	$	(14)	Net of tax and noncontrolling interest
Amortization of Postretirement Benefit
Prior service cost	$	(1)	$	(1)	Other income
Actuarial gains (losses)	(1)		—		Other income
	(1)		(1)		Total before tax
	—		—		Provision for income taxes
	$	(1)	$	(1)	Net of tax and noncontrolling interest
Credit Risk Changes of Fair Value Option Liabilities
	$	—	$	—	Credit risk changes of fair value option liabilities
	—		—		Provision for income taxes
	—		—		Net of tax and noncontrolling interest
Total reclassifications for the period	$	19	$	(15)	Net of tax and noncontrolling interest

(1)Net unrealized investment gains (losses) on available for sale securities are included in Ambac's Consolidated Statements of Comprehensive Income as a component of Accumulated Other Comprehensive Income. Changes in these amounts include reclassification adjustments to exclude from "Other comprehensive income (loss)" those items that are included as part of "Net income" for a period that has been part of "Other comprehensive income (loss)" in earlier periods.