Acquisitions, Goodwill and Other Intangible Assets (Aquisitions) (Details) € in Millions, $ in Millions			6 Months Ended
	Nov. 02, 2015 EUR (€)	Nov. 02, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Payments To Acquire Businesses And Interest In Affiliates [Abstract]
Payments to Acquire Businesses, Net of Cash Acquired			$ 206	$ 1,723
Acquisition Alstom
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets [Abstract]
Cash And Equivalents			1,750
Current Receivables			4,050
Inventory			4,750
Property Plant And Equipment			2,900
Goodwill			14,750
Intangible Assets Other			4,500
Other Assets			3,950
Total Assets			36,650
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities [Abstract]
Account Payable			1,900
Progress Collections			2,950
Accrued Contract Liabilities			8,600
All Other Liabilities			7,700
Total Liabilities			21,150
Redeemable Noncontrolling Interest Equity			3,000
Acquisition noncontrolling interest fair value		$ 3,600	600
Payments To Acquire Businesses And Interest In Affiliates [Abstract]
Payments To Acquire Businesses Gross			11,900
Cash acquired from acquisition	€ 1,600	1,765	1,750
Payments to Acquire Businesses, Net of Cash Acquired	€ 9,200	$ 10,124	10,100
Assumed Deferred Tax Assets			450
Assumed Loss Carry Forward			50
Assumed Indemnification Receivables			150
Unrecognized Tax Benefits Increases Resulting From Acquisition			750
Assumed employee related costs			$ 750