Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes Paid	$ 6	$ 15	$ 11
Restricted Cash	14	5	13
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	61	23	35	$ 81
Decrease in long-term debt as a result of surplus notes exchanges		71
Securities acquired in transactions related to Puerto Rico restructurings	508
Loans acquired through financial guarantee subrogation	20
VIE long-term debt issued related to Puerto Rico restructurings	583
Long-term Debt [Member]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	283	80	107
Variable Interest Entity, Primary Beneficiary [Member]
Restricted Cash	$ 17	$ 2	$ 2