Investments in Affiliates (Schedule of Balances with Affiliates) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Trade receivables	$ 0	$ 3
Non-trade receivables	15	20
Total due from affiliates	15	23
Short-term borrowings	34	48
Trade payables	4	16
Current Other liabilities	8	8
Total due to affiliates	$ 46	$ 72