Debt (Schedule of Short-term Debt) (Details) - USD ($) $ in Millions		Mar. 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		$ 26	$ 28
Short-term borrowings, including amounts due to affiliates	[1]	361	81
Total		$ 749	$ 496
Weighted average interest rate, short-term borrowings		1.80%	2.30%
Loans Payable [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Short-term borrowings, including amounts due to affiliates	[1]	$ 300
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		1.30%	1.60%
Accounts Receivable Securitization Facility [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Borrowings outstanding	[2]	$ 115	$ 115
Weighted average interest rate, short-term borrowings		2.30%	2.40%
Revolving Credit Facility [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Borrowings outstanding	[3]	$ 247	$ 272

[1] The weighted average interest rate was 1.8% and 2.3% as of March 31, 2020 and December 31, 2019, respectively.

[2] The weighted average interest rate was 2.3% and 2.4% as of March 31, 2020 and December 31, 2019, respectively.

[3] The weighted average interest rate was 1.3% and 1.6% as of March 31, 2020 and December 31, 2019, respectively.