Long-Term Debt and Short-Term Borrowings - Quarter End (Details)	1 Months Ended		6 Months Ended
	May 31, 2016 EUR (€)	Aug. 31, 2014 USD ($)	Jun. 30, 2016 USD ($)
Five-year credit facility agreement
Debt Instrument [Line Items]
Term of debt instrument		5 years	5 years
Credit facility amount prior to new agreement		$ 2,250,000,000
Current borrowing capacity			$ 3,750,000,000
Maximum increase available subject to lender approval			1,250,000,000
Maximum borrowing capacity including portion subject to lender approval			$ 5,000,000,000
Required minimum EBITDA to Interest Ratio			3.0
Number of consecutive quarters over which the ratio of required EBITDA to Interest Ratio is calculated			4
Actual EBITDA to Interest Ratio			51
Fixed rate euro medium term note due February 2022
Debt Instrument [Line Items]
Principal amount | €	€ 500,000,000
Term of debt instrument	5 years 9 months
Interest rate, stated percentage (as a percent)	0.375%
Fixed rate euro medium term note due 2031
Debt Instrument [Line Items]
Principal amount | €	€ 500,000,000
Term of debt instrument	15 years
Interest rate, stated percentage (as a percent)	1.50%