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Equity AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Partners' Capital Notes [Abstract]      
Available-for-sale securities (1) $ 4 $ 13  
Foreign currency translation adjustment (5)   $ (5)
Actuarial loss related to pensions and other postretirement benefits (19) (25)  
Investments in unconsolidated affiliates, net (17) (1)  
Total AOCI, net of tax $ (37) $ (18) [1]  
[1]
*As adjusted. See Note 1.