Derivative Financial Instruments and Risk Management (Details 4) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Offsetting Assets
Gross Amount of Recognized Assets	$ 294	$ 298
Gross Amounts Offset in the Statement of Fnancial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	294	298
Financial Instruments	(103)	(71)
Cash Collateral Received	0	0
Net Amount of Assets	191	227
Machinery and Power Systems
Offsetting Assets
Gross Amount of Recognized Assets	86	60
Gross Amounts Offset in the Statement of Fnancial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	86	60
Financial Instruments	(84)	(59)
Cash Collateral Received	0	0
Net Amount of Assets	2	1
Financial Products
Offsetting Assets
Gross Amount of Recognized Assets	208	238
Gross Amounts Offset in the Statement of Fnancial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	208	238
Financial Instruments	(19)	(12)
Cash Collateral Received	0	0
Net Amount of Assets	$ 189	$ 226