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Debt (Schedule of Short-term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates    
Current installments of long-term debt $ 431 $ 28
Short-term borrowings, including amounts due to affiliates [1] 65 81
Total $ 496 $ 496
Weighted average interest rate, short-term borrowings 0.60% 2.30%
Revolving Credit Facility [Member]    
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates    
Line of Credit, Current [3] $ 0 [2] $ 272
Weighted average interest rate, short-term borrowings 0.00% 1.60%
Accounts Receivable Securitization Facility [Member]    
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates    
Line of Credit, Current [4] $ 0 $ 115
Weighted average interest rate, short-term borrowings 0.00% 2.40%
Short-term Debt [Member]    
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates    
Short-term borrowings, including amounts due to affiliates $ 300  
[1] The weighted average interest rate was 0.6% and 2.3% as of December 31, 2020 and 2019, respectively. During the year ended December 31, 2020, the Company entered into an aggregate of $300 million in short-term, bilateral term loans, which were repaid during the same period.
[2] The Company borrowed $685 million and repaid $963 million under its senior unsecured revolving credit facility during the year ended December 31, 2020.
[3] The weighted average interest rate was 0.0% and 1.6% as of December 31, 2020 and 2019, respectively.
[4] The weighted average interest rate was 0.0% and 2.4% as of December 31, 2020 and 2019, respectively.