Borrowing and Lines of Credit (Narrative) (Details)	9 Months Ended
	Sep. 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]
Long-term Line of Credit	0
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,200,000,000
Line of Credit Facility, Expiration Date	Aug. 05, 2021
Multicurrency Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit	$ 0
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,150,000,000
Line of Credit Facility, Expiration Date	Aug. 05, 2021