Provision for Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Taxes Information [Line Items]
Exchange gain (loss) associated with hedging program	$ 35	$ (157)
Tax credit carryforward/back, net	1,199
Tax effect of net carryforwards/backs, net of valuation allowances, not subject to expiration	1,009
Unremitted earnings of subsidiaries outside the U.S.	15,978
Expires after 2013 but before 2018 [Member]
Income Taxes Information [Line Items]
Tax credit carryforward/back, net	19
Expiration date of net carryforwards/backs	before the end of 2018
Expires after 2018 [Member]
Income Taxes Information [Line Items]
Tax credit carryforward/back, net	$ 171
Expiration date of net carryforwards/backs	after 2018