Long-Term Debt and Credit Facilities (Details 1) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 EUR (€)	Dec. 31, 2015 EUR (€)
Notes
Schedule of U.S. dollar and Euro denominated notes [Line Items]
Retirement of Notes - Portion Due in Current Year		$ 250	€ 250
Thirty Year Notes at 4 Percent [Member]
Schedule of U.S. dollar and Euro denominated notes [Line Items]
Face amount	$ 600
Debt Instrument, Term	30 years
Fixed Interest rate	4.00%			4.00%
Four Year Notes at Variable Rate [Member]
Schedule of U.S. dollar and Euro denominated notes [Line Items]
Face amount | €				€ 500
Debt Instrument, Term	4 years
Forty Year Notes at Variable Rate [Member]
Schedule of U.S. dollar and Euro denominated notes [Line Items]
Face amount		$ 134
Debt Instrument, Term		40 years	40 years
Five Year Notes at 1 Point 75 Percent [Member]
Schedule of U.S. dollar and Euro denominated notes [Line Items]
Face amount		$ 500
Debt Instrument, Term		5 years	5 years
Fixed Interest rate		1.75%
Ten Year Note at 3 point 25 Percent [Member]
Schedule of U.S. dollar and Euro denominated notes [Line Items]
Face amount		$ 500
Debt Instrument, Term		10 years	10 years
Fixed Interest rate		3.25%