Borrowing and Lines of Credit (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Line of Credit Facility [Line Items]
Aggregate Line of Credit Facility Maximum Borrowing Capacity	$ 5,850,000,000
Maximum Commercial Paper Borrowing Authority	4,350,000,000
Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,200,000,000
Line of Credit Facility, Amount Outstanding	0
Line of Credit Facility, Expiration Date	May 23, 2019
Multicurrency Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,150,000,000
Line of Credit Facility, Amount Outstanding	0
Line of Credit Facility, Expiration Date	May 23, 2019
Short term Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,500,000,000
Line of Credit Facility, Initiation Date	Mar. 11, 2015
Line of Credit Facility, Amount Outstanding	$ 0
Line of Credit Facility, Expiration Date	Sep. 11, 2015