Supplemental Cash Flow Information - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Supplemental Cash Flow Information [Abstract]
Transfer from investments	$ 53	$ 51
Non-cash investing activities, right-of-use asset obtained	15
Non-cash investing activities, debt assumed	51
Non-cash financing activities related to the issuance of shares for vested restricted stock units	37	64
Operating lease, payments	66	83
Right-of-use asset obtained in exchange for operating lease liability	$ 6	$ 16