Statutory Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statutory Accounting Practices [Line Items]
Dividends available to be paid	$ 6,800
Approximate increase in statutory capital and surplus resulting from discount of certain A&E liabilities	129	$ 140
Minimum statutory capital and surplus required to satisfy regulatory requirements	32,700	29,900
Statutory Accounting Practices, Permitted Practice, Amount	72	55
PropertyAndCasualtySubsidiaries [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	46,397	46,494
Statutory net income	7,711	4,354	$ 6,046
LifeSubsidiaries [Member] [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	2,187	1,632
Statutory net income	$ 425	$ (245)	$ (210)