Business and Basis of Presentation (Value of Business Acquired) (Details) - USD ($) $ in Millions	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021	Jan. 01, 2021
Value of Business Acquired [Line Items]
Balance, BOP	$ 621	[1]			$ 1,163
Balance, EOP	530		$ 621	[1]		$ 1,163
Other businesses
Value of Business Acquired [Line Items]
Balance, BOP	24		237		252
Balance, EOP	19		24		237	252
As Previously Reported
Value of Business Acquired [Line Items]
Balance, BOP	595					1,103
Balance, EOP			595
As Previously Reported | Other businesses
Value of Business Acquired [Line Items]
Balance, BOP						251
Effect of Change
Value of Business Acquired [Line Items]
Balance, BOP	26				60
Balance, EOP			26			60
Effect of Change | Other businesses
Value of Business Acquired [Line Items]
Balance, BOP					1
Balance, EOP						1
Gibraltar Life and Other
Value of Business Acquired [Line Items]
Balance, BOP	597		746			911
Balance, EOP	$ 511		$ 597		746
Gibraltar Life and Other | International Businesses
Value of Business Acquired [Line Items]
Balance, BOP					911
Balance, EOP						911
Gibraltar Life and Other | As Previously Reported | International Businesses
Value of Business Acquired [Line Items]
Balance, BOP						852
Gibraltar Life and Other | Effect of Change | International Businesses
Value of Business Acquired [Line Items]
Balance, BOP					$ 59
Balance, EOP						$ 59

[1] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.