Unpaid Claims and Claims Expense Short Duration Contracts (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Liability for Claims and Claims Adjustment Expense	$ 2,558	$ 2,557	$ 2,480	$ 2,110
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	(67)	(94)	(57)	(81)
Liability For Unpaid Claims And Claims Adjustment Expense Net Of Recoverable	2,491	2,463	$ 2,423	$ 2,029
Current Year Claims and Claims Adjustment Expense	363	726
Prior Year Claims and Claims Adjustment Expense	(25)	(51)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	338	675
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	(23)	(25)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	(249)	(260)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	(272)	(285)
Interest On Liability For Policy And Contract Claims	8	8
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss)	(6)	36
Liability for Unpaid Claims and Claims Adjustment Expense Other	$ 2	$ 44