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Leases - Sale and Leased-backed asset and obligation (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Property, plant and equipment - at cost      
Finance lease asset $ 9,333   $ 8,738
Finance lease liability $ 132    
Municipal securities      
Property, plant and equipment - at cost      
Finance lease liability   $ 9  
Constructed machinery and equipment      
Property, plant and equipment - at cost      
Finance lease asset   $ 9