Supplemental Cash Flow Information - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplementary Insurance Information
Non-cash modifications of certain mortgage loans, fixed income securities, limited partnership interests and other investments, as well as mergers completed with equity securities	$ 51	$ 55	$ 131
Non-cash financing activities related to the issuance of shares for vested restricted stock units	53	56	50
Operating lease, payments	181	156	155
Right-of-use asset obtained in exchange for operating lease liability	$ 98	$ 51	604
Cumulative effect of change in accounting principle
Supplementary Insurance Information
Right-of-use asset obtained in exchange for operating lease liability			$ 488