Statutory Financial Data and Restrictions - Schedule of Statutory Financial Data and Restrictions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory Accounting Practices [Line Items]
Decrease in statutory net income (loss)		$ 99
Increase in capital and surplus		136
General Insurance
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ 3,319	4,222	$ 1,841
Statutory capital and surplus	33,476	34,952
Aggregate minimum required statutory capital and surplus	10,994	11,948
General Insurance | Domestic
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	2,272	2,649	1,044
Statutory capital and surplus	19,563	19,385
Aggregate minimum required statutory capital and surplus	3,680	3,897
General Insurance | Foreign
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	1,047	1,573	797
Statutory capital and surplus	13,913	15,567
Aggregate minimum required statutory capital and surplus	7,314	8,051
Life Insurance Companies
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	3,096	2,593	493
Statutory capital and surplus	12,715	13,100
Aggregate minimum required statutory capital and surplus	4,251	4,117
Life Insurance Companies | Domestic
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	3,091	2,588	482
Statutory capital and surplus	12,229	12,471
Aggregate minimum required statutory capital and surplus	4,057	3,903
Life Insurance Companies | Foreign
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	5	5	$ 11
Statutory capital and surplus	486	629
Aggregate minimum required statutory capital and surplus	$ 194	$ 214