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Debt (Schedule of Short-term Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates    
Current installments of long-term debt $ 30 $ 431
Short-term borrowings, including amounts due to affiliates [1] 70 65
Total $ 500 $ 496
Weighted average interest rate, short-term borrowings 0.20% 0.60%
Revolving Credit Facility [Member]    
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates    
Weighted average interest rate, short-term borrowings 1.60% 0.00%
Revolving Credit Facility [Member]    
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates    
Borrowings outstanding [2] $ 400 $ 0
[1] The weighted average interest rate was 0.2% and 0.6% as of June 30, 2021 and December 31, 2020, respectively.
[2] The weighted average interest rate was 1.6% and 0.0% as of June 30, 2021 and December 31, 2020, respectively.