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Investment in Unconsolidated Affiliate - Summary of Financial Information for Significant Unconsolidated Affiliates Accounted for Under the Equity Method (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets Acquired      
Total current assets $ 16,219 $ 17,046  
Total assets 74,619 77,539  
Liabilities      
Total current liabilities 15,637 15,727  
Total liabilities 41,290 42,682  
Income Statement [Abstract]      
Net income 975 914 $ 1,187
Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Assets Acquired      
Total current assets 5,534 4,288  
Total long-term assets 769 1  
Total assets 6,303 4,289  
Liabilities      
Total current liabilities 5,478 4,243  
Total long-term liabilities 336 0  
Total liabilities 5,814 4,243  
Income Statement [Abstract]      
Total revenue 963 467  
Total expenses 597 249  
Operating income 366 218  
Net income $ 351 $ 215