Borrowing and Lines of Credit (Narrative) (Details)	6 Months Ended
	Jun. 30, 2016 USD ($)
Line of Credit Facility [Line Items]
Aggregate Line of Credit Facility Maximum Borrowing Capacity	$ 4,350,000,000
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