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Investments in Affiliates (Summarized Balance Sheet Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Investment In Affiliates [Abstract]    
Current assets $ 247 $ 212
Property, plant and equipment, net 7,680 7,800
Equity Method Investment, Summarized Financial Information, Noncurrent Assets 40 39
Total assets 7,967 8,051
Current Liabilities 738 1,534
Non-current liabilities 3,242 3,439
Equity 3,987 3,078
Total liabilities and equity $ 7,967 $ 8,051