Debt (Schedule of Short-term Debt) (Details) - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Current installments of long-term debt		$ 367		$ 63
Short-term borrowings, including amounts due to affiliates	[1]	77		86
Total		$ 561		$ 326
Weighted average interest rate, short-term borrowings		3.20%		3.40%
Revolving Credit Facility [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Line of Credit, Current	[3]	$ 40	[2]	$ 97
Weighted average interest rate, short-term borrowings		6.00%		4.10%
Accounts Receivable Securitization Facility [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Line of Credit, Current	[5]	$ 77	[4]	$ 80
Weighted average interest rate, short-term borrowings		3.10%		2.10%

[1] The weighted average interest rate was 3.2% and 3.4% as of December 31, 2018 and 2017, respectively.

[2] The Company borrowed $940 million and repaid $997 million under its senior unsecured revolving credit facility during the year ended December 31, 2018.

[3] The weighted average interest rate was 6.0% and 4.1% as of December 31, 2018 and 2017, respectively.

[4] The Company borrowed $25 million and repaid $28 million during the year ended December 31, 2018

[5] The weighted average interest rate was 3.1% and 2.1% as of December 31, 2018 and 2017, respectively.