Insurance - Changes in the Reserve for Unpaid Claims and Loss Adjustment Expenses (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Liability for unpaid claims and claims adjustment expense
Balance at beginning of period	$ 118	$ 148
Less reinsurance recoverables	(3)	(3)	$ (3)	$ (3)
Net balance at beginning of period			115	145
Additions for losses and loss adjustment expenses incurred to:
Current year	142	158
Prior years	(15)	(19)
Total	127	139
Reductions for losses and loss adjustment expenses paid related to:
Current year	(77)	(91)
Prior years	(61)	(79)
Total	(138)	(170)
Foreign currency translation adjustment	1	0
Net balance at end of period	105	114
Plus reinsurance recoverables	3	3	$ 3	$ 3
Balance at end of period	$ 108	$ 117