Debt - Long-Term Debt (Parenthetical) (Details)	Jun. 30, 2016
2.70 % Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument Stated interest rate	2.70%
2.75 % Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument Stated interest rate	2.75%
TVN 7.38% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument Stated interest rate	7.38%
2.80 % Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument Stated interest rate	2.80%
3.50 % Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument Stated interest rate	3.50%
3.90 % Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument Stated interest rate	3.90%
3.95 % Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument Stated interest rate	3.95%