Supplemental Cash Flow Information - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Supplemental Cash Flow Information [Abstract]
Transfer from investments	$ 54	$ 111
Non-cash investing activities, right-of-use asset obtained	15
Non-cash investing activities, debt assumed	123
Non-cash financing activities related to the issuance of shares for vested restricted stock units	38	65
Operating lease, payments	101	127
Right-of-use asset obtained in exchange for operating lease liability	$ 26	$ 17