Investments in Debt and Equity Securities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Schedule of Investments in Debt and Equity Securities
Cost basis	$ 2,883	$ 1,694
Unrealized pretax net gains (losses)	(106)	27
Fair Value	2,777	1,721
U.S. treasury bonds
Schedule of Investments in Debt and Equity Securities
Cost basis	10	10
Unrealized pretax net gains (losses)	0	0
Fair Value	10	10
Other U.S. and non-U.S. government bonds
Schedule of Investments in Debt and Equity Securities
Cost basis	57	61
Unrealized pretax net gains (losses)	(2)	0
Fair Value	55	61
Corporate bonds
Schedule of Investments in Debt and Equity Securities
Cost basis	2,106	1,027
Unrealized pretax net gains (losses)	(77)	19
Fair Value	2,029	1,046
Asset-backed securities
Schedule of Investments in Debt and Equity Securities
Cost basis	185	175
Unrealized pretax net gains (losses)	(4)	1
Fair Value	181	176
U.S. governmental agency mortgage-backed securities
Schedule of Investments in Debt and Equity Securities
Cost basis	384	319
Unrealized pretax net gains (losses)	(17)	6
Fair Value	367	325
Residential
Schedule of Investments in Debt and Equity Securities
Cost basis	3	4
Unrealized pretax net gains (losses)	0	0
Fair Value	3	4
Commercial
Schedule of Investments in Debt and Equity Securities
Cost basis	138	98
Unrealized pretax net gains (losses)	(6)	1
Fair Value	$ 132	$ 99