Other Assets (BMC Holdco) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
(Loss) gain on nonmarketable equity investments, net	$ (135)	$ 1	$ (133)	$ 104
Impairment charges	137	$ 0	140	$ 1
Carrying amount, equity investments without a readily determinable fair value	120		120		$ 260
Upward adjustments	178		178		183
Downward adjustments (including impairment)	144		144		12
BMC Holdco
Schedule of Equity Method Investments [Line Items]
Pre-money equity valuation					6,900
BMC Holdco
Schedule of Equity Method Investments [Line Items]
(Loss) gain on nonmarketable equity investments, net					38
Proceeds from sale of equity securities without readily determinable fair value					$ 45
Impairment charges	136
Carrying amount, equity investments without a readily determinable fair value	19		19
Upward adjustments	136		136
Downward adjustments (including impairment)	$ 136		$ 136