Equity Method Investments - Carrying Value (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 971	$ 1,079
MLU B.V.
Schedule of Equity Method Investments [Line Items]
Equity method investments	927	1,001
Mission Bay 3 and 4
Schedule of Equity Method Investments [Line Items]
Equity method investments	38	41
Other
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 6	$ 37