Debt (Schedule of Short-term Debt) (Details) - USD ($) $ in Millions		Mar. 31, 2016		Dec. 31, 2015
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Current installments of long-term debt		$ 58		$ 56
Short-term borrowings, including amounts due to affiliates	[1]	58		52
Total		$ 116		$ 513
Weighted average interest rate, short-term borrowings		2.80%		3.30%
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]	$ 350
Weighted average interest rate for lines of credit				1.80%
Accounts Receivable Securitization Facility [Member]
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Line of credit, current	[5]	$ 0	[4]	$ 55
Weighted average interest rate for lines of credit				0.80%

[1] The weighted average interest rate was 2.8% and 3.3% as of March 31, 2016 and December 31, 2015, respectively.

[2] The Company borrowed $245 million and repaid $595 million during the three months ended March 31, 2016.

[3] The weighted average interest rate was 1.8% as of December 31, 2015.

[4] The Company repaid $55 million during the three months ended March 31, 2016.

[5] The weighted average interest rate was 0.8% as of December 31, 2015.