Equity Method Investments - Carrying Value (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 1,079	$ 1,364
MLU B.V.
Schedule of Equity Method Investments [Line Items]
Equity method investments	1,001	1,224
Mission Bay 3 and 4
Schedule of Equity Method Investments [Line Items]
Equity method investments	41	140
Equity method investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 37	$ 0