Fair Value Disclosures (Details) (Fair Value, Measurements, Recurring, USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assets
Derivative financial instruments, net	$ 223	$ 232	$ 189
Total Assets	223	232	189
Liabilities
Guarantees	2	2	3
Total liabilities	2	2	3
Level 1
Assets
Derivative financial instruments, net	0	0	0
Total Assets	0	0	0
Liabilities
Guarantees	0	0	0
Total liabilities	0	0	0
Level 2
Assets
Derivative financial instruments, net	223	232	189
Total Assets	223	232	189
Liabilities
Guarantees	0	0	0
Total liabilities	0	0	0
Level 3
Assets
Derivative financial instruments, net	0	0	0
Total Assets	0	0	0
Liabilities
Guarantees	2	2	3
Total liabilities	$ 2	$ 2	$ 3

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of contractual guarantees to which the Company is obligated as of the balance sheet date.

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