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Provision for Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Exchange gains (losses) associated with hedging program	$ (133)	$ 117
Tax effect of net carryforwards/backs, net of valuation allowances	1,428
Expiration date of net carryforwards/backs	after 2016
Undistributed Earnings of Foreign Subsidiaries	13,350
Not Subject to Expiration [Member]
Tax effect of net carryforwards/backs, net of valuation allowances	1,204
Expires after 2011 but before 2016 [Member]
Tax effect of net carryforwards/backs, net of valuation allowances	70
Expires after 2016 [Member]
Tax effect of net carryforwards/backs, net of valuation allowances	$ 154

The sum of the tax effects as of the balance sheet date of the amount of excesses of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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