Debt (Details)	1 Months Ended		9 Months Ended					9 Months Ended		1 Months Ended
	Sep. 30, 2014 USD ($) Rate	Jul. 31, 2014 USD ($) Rate	Sep. 30, 2014 USD ($) Rate	Sep. 30, 2014 CAD	Dec. 31, 2013 USD ($)	Sep. 30, 2014 North America Segment [Member] USD ($)	Dec. 31, 2013 North America Segment [Member] USD ($)	Sep. 30, 2014 International Segment [Member] USD ($)	Dec. 31, 2013 International Segment [Member] USD ($)	Jul. 31, 2014 July Two Thousand Seventeen [Member] USD ($)	Jul. 31, 2014 July Two Thousand Nineteen [Member] USD ($)	Sep. 30, 2014 September Two Thousand Seventeen [Member] USD ($)	Sep. 30, 2014 September Two Thousand Twenty One [Member] USD ($)	Oct. 23, 2014 Subsequent Event [Member] Minimum [Member] EUR (€) Rate
Debt Instrument [Line Items]
New Credit Facilities During Period			$ 445,000,000
Proceeds from Secured Notes Payable			7,100,000,000
Unsecured debt	10,842,000,000		10,842,000,000		6,973,000,000	7,858,000,000	4,000,000,000	2,984,000,000	2,973,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	3.00%	2.625%												1.875%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	4.375%	3.50%
Proceeds from Issuance of Senior Long-term Debt	2,000,000,000	1,500,000,000		400,000,000						700,000,000	800,000,000	750,000,000	1,250,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.25%		3.25%	3.25%
Proceeds from Unsecured Lines of Credit								181,000,000
Proceeds from Issuance of Medium-term Notes														€ 500,000,000
Debt Instrument, Maturity Date										Jul. 31, 2017	Jul. 31, 2019	Sep. 30, 2017	Sep. 30, 2021	Oct. 31, 2019