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Investments in Unconsolidated Affiliates - Summary of Financial Information for Significant Unconsolidated Affiliates Accounted for Under the Equity Method (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2019
USD ($)
Equity Method Investments and Joint Ventures [Abstract]  
Total current assets $ 4,103
Total long-term assets 1
Total assets 4,104
Total current liabilities 4,063
Total long-term liabilities 0
Total liabilities 4,063
Total revenues 189
Total expenses 106
Operating income 83
Net income 81
Income from investments in unconsolidated affiliates $ 11