Investments in Debt and Equity Securities (Details 2) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months - Fair Value	$ 2,288	$ 359
Less than 12 months - Unrealized losses	114	5
12 months or more - Fair Value	360	55
12 months or more - Unrealized losses	47	1
Total - Fair Value	2,648	414
Total - Unrealized losses	161	6
Other U.S. and non-U.S. government bonds
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months - Fair Value	31
Less than 12 months - Unrealized losses	1
12 months or more - Fair Value	15
12 months or more - Unrealized losses	1
Total - Fair Value	46
Total - Unrealized losses	2
Corporate bonds
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months - Fair Value	1,774	270
Less than 12 months - Unrealized losses	75	4
12 months or more - Fair Value	218	33
12 months or more - Unrealized losses	33	1
Total - Fair Value	1,992	303
Total - Unrealized losses	108	5
Asset-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months - Fair Value	102
Less than 12 months - Unrealized losses	4
12 months or more - Fair Value	35
12 months or more - Unrealized losses	1
Total - Fair Value	137
Total - Unrealized losses	5
U.S. governmental agency mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months - Fair Value	293	89
Less than 12 months - Unrealized losses	27	1
12 months or more - Fair Value	51	22
12 months or more - Unrealized losses	9	0
Total - Fair Value	344	111
Total - Unrealized losses	36	$ 1
Commercial
Available-for-sale Securities, Continuous Unrealized Loss Position
Less than 12 months - Fair Value	88
Less than 12 months - Unrealized losses	7
12 months or more - Fair Value	41
12 months or more - Unrealized losses	3
Total - Fair Value	129
Total - Unrealized losses	$ 10