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Investments Accounted For by the Equity Method and Variable Interest Entities - Entities that are Consolidated (Details) - Variable Interest Entity - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]    
Current assets $ 3 $ 3
Net property, plant and equipment 71 76
Other long-term assets 27 28
Total assets 101 107
Current liabilities 4 2
Long-term debt 24 29
Other long-term liabilities 8 7
Total liabilities 36 38
Redeemable noncontrolling interests 20 19
Net assets less noncontrolling interests $ 45 $ 50