Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets:
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450)	$ 3,065
Short-term investments, at fair value (amortized cost of $691 and $653)	692	$ 653
Other investments	401	478
Total investments (net of allowance for credit losses of $0 at June 30, 2020)	3,466	3,792
Cash and cash equivalents	17	24
Restricted Cash	15	55
Premium receivables (net of allowance for credit losses of $16 at June 30, 2020)	392	416
Reinsurance recoverable on paid and unpaid losses (net of allowance for credit losses of $0 at June 30, 2020)	36	26
Deferred ceded premium	75	82
Subrogation recoverable	2,215	2,029
Derivative assets	97	75
Income Taxes Receivable	18	11
Insurance intangible asset	392	427
Other assets	145	95
Total assets	12,761	13,320
Liabilities:
Unearned premiums	492	518
Loss and loss expense reserves	1,814	1,548
Ceded premiums payable	27	29
Long-term debt	2,749	2,822
Accrued interest payable	474	441
Derivative Liability	134	90
Other liabilities	83	93
Total liabilities	11,632	11,783
Stockholders’ equity:
Preferred stock, par value $0.01 per share; 20,000,000 shares authorized; issued and outstanding shares—none	0	0
Common Stock, Value, Issued	0	0
Additional paid-in capital	237	232
Accumulated other comprehensive income	(48)	42
Retained earnings	881	1,203
Treasury stock, shares at cost: 0 and 8,202	(1)	0
Total Ambac Financial Group, Inc. stockholders’ equity	1,069	1,477
Noncontrolling interest	60	60
Total stockholders’ equity	1,129	1,536
Total liabilities and stockholders’ equity	12,761	13,320
Deferred Income Tax Liabilities, Net	24	32
Variable Interest Entity, Primary Beneficiary [Member]
Assets:
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450)	3,041	3,121
Restricted Cash	2	2
Derivative assets	61	52
Other assets	2	3
Liabilities:
Long-term debt	4,125	4,554
Accrued interest payable	0	1
Derivative Liability	1,709	1,657
Stockholders’ equity:
Financing Receivable, after Allowance for Credit Loss	2,787	3,108
Fixed Income Securities [Member]
Assets:
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450)	2,218	2,577
Collateral Pledged [Member] | Fixed Income Securities [Member]
Assets:
Fixed income securities, at fair value (amortized cost of $2,126 and $2,450)	$ 155	$ 85