Property, Plant and Equipment (Summary of Property and Equipment, net) (Parenthetical) (Details) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Other property and equipment, net	[1]	$ 1,508	$ 1,472
CDM [Member]
Property Plant And Equipment [Line Items]
Other property and equipment, net		$ 119	$ 111

[1] (1) $119 million and $111 million related to CDM in 2022 and 2021, respectively.