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Investments in Affiliates (Summarized Balance Sheet Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Investment In Affiliates [Abstract]    
Current assets $ 212 $ 206
Property, plant and equipment, net 7,800 8,437
Equity Method Investment, Summarized Financial Information, Noncurrent Assets 39 43
Total assets 8,051 8,686
Current Liabilities 1,534 861
Non-current liabilities 3,439 4,492
Equity 3,078 3,333
Total liabilities and equity $ 8,051 $ 8,686