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Supplemental Disclosures (Schedule of Analysis for Doubtful Accounts) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	$ 105	$ 114	$ 107
Provision charged to operations	11	11	20
Accounts written-off, net of recoveries	(12)	(21)	(26)
Effect of exchange rate changes and other	2	1	13
Balance at end of year	$ 106	$ 105	$ 114

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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