Supplemental Balance Sheet Information (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net reclassification from AOCI for cash flow hedges included in cost of products sold	$ 3,070us-gaap_CostOfGoodsSold	$ 2,989us-gaap_CostOfGoodsSold	$ 2,829us-gaap_CostOfGoodsSold
Net reclassification from AOCI for amortization of prior service cost included in selling and administrative expenses	339	320	304
Income tax expense on reclassification from AOCI included in income tax expense (benefit)	7us-gaap_IncomeTaxExpenseBenefit	11us-gaap_IncomeTaxExpenseBenefit	12us-gaap_IncomeTaxExpenseBenefit
Net amount reclassified from AOCI	38us-gaap_ProfitLoss	46us-gaap_ProfitLoss	(125)us-gaap_ProfitLoss
Derivatives \| Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net reclassification from AOCI for cash flow hedges included in cost of products sold	4	1
Income tax expense on reclassification from AOCI included in income tax expense (benefit)	0	0
Net amount reclassified from AOCI	4	1
Pension and Other Postretirement Benefit Plans \| Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net reclassification from AOCI for cash flow hedges included in cost of products sold	7	(19)
Net reclassification from AOCI for amortization of prior service cost included in selling and administrative expenses	(10)	(7)
Income tax expense on reclassification from AOCI included in income tax expense (benefit)	1	2
Net amount reclassified from AOCI	(2)	(24)
Foreign Currency Translation \| Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net reclassification from AOCI for amortization of prior service cost included in selling and administrative expenses	5	0
Income tax expense on reclassification from AOCI included in income tax expense (benefit)	0	0
Net amount reclassified from AOCI	$ 5	$ 0

Total costs related to goods produced and sold during the reporting period.

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