Investments in Affiliates (Schedule of Balances with Affiliates) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Non-trade receivables		$ 29	$ 21
Total due from affiliates		29	21
Short-term borrowings	[1]	50	32
Trade payables		46	36
Current Other liabilities		11	8
Total due to affiliates		$ 107	$ 76

[1] The Company has agreements with certain affiliates whereby excess affiliate cash is lent to and managed by the Company at variable interest rates governed by those agreements.