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Investments in Affiliates (Summarized Balance Sheet Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Investment In Affiliates [Abstract]    
Current assets $ 206 $ 214
Property, plant and equipment, net 8,336 8,726
Other assets 43 181
Total assets 8,585 9,121
Current Liabilities 861 816
Non-current liabilities 4,492 4,940
Equity 3,232 3,365
Total liabilities and equity $ 8,585 $ 9,121