Business and Basis of Presentation Supplemental Cash Flow information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents, at Carrying Value	$ 54	$ 54	$ 32
Income Taxes Paid		11	9
Restricted Cash	16	16	13	$ 12
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	117	117	302	274	$ 61
Securities acquired (transferred) in transactions related to Puerto Rico restructurings	0		(1)
Securities acquired (transferred) in connection with financial guarantee commutations		(65)
VIE long-term debt issued related to Puerto Rico restructurings		0	133
Reduction in VIE Long-term DEbt Due to Deconsolidation		0	133
Stock Issued During Period, Value, Acquisitions	29	29
Long-term Debt [Member]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		0	50
Variable Interest Entity, Primary Beneficiary [Member]
Restricted Cash	$ 47	$ 47	$ 256	$ 246