Property, Plant And Equipment (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 1,906	$ 1,844	$ 1,811
Interest capitalized	102us-gaap_InterestCostsCapitalized	87us-gaap_InterestCostsCapitalized	74us-gaap_InterestCostsCapitalized
Rental expense for leased properties	277us-gaap_LeaseAndRentalExpense	287us-gaap_LeaseAndRentalExpense	276us-gaap_LeaseAndRentalExpense
Minimum rental payments under capital leases, total	158
Minimum rental payments under operating leases with initial or remaining terms of one year or more, total	1,486
Sublease payments under operating lease	17
Property, plant and equipment included in accounts payable	299	213
Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 1,414	$ 1,338	$ 1,248

Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount of minimum lease payments for capital leases.

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-Glossary Allowance for Funds Used during Construction

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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