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Investment in Unconsolidated Affiliate - Summary of Financial Information for Significant Unconsolidated Affiliates Accounted for Under the Equity Method (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Equity Method Investments and Joint Ventures [Abstract]  
Total current assets $ 4,288
Total long-term assets 1
Total assets 4,289
Total current liabilities 4,243
Total long-term liabilities 0
Total liabilities 4,243
Total revenue 467
Total expenses 249
Operating income 218
Net income 215
Income from investments in unconsolidated affiliates $ 27