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Equity Method Investments - Carrying Value (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 1,299 $ 1,364
MLU B.V.    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 1,244 1,224
Mission Bay 3 and 4    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 50 140
Other    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 5 $ 0