Statements of Consolidated Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 354,027	$ 316,606	$ 1,007,758	$ 874,869
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments		(66,366)	68,024	(218,662)	119,274
Pension and other postretirement benefit adjustments:
Amounts reclassified from Other comprehensive (loss) income	[1]	(492)	409	(557)	794
Total pension and other postretirement benefit adjustments		(492)	409	(557)	794
Unrealized net gains (losses) on available-for-sale securities:
Amounts recognized in Other comprehensive (loss) income	[2]		643		1,513
Amounts reclassified from Other comprehensive (loss) income	[3]		(852)	(2,320)	(844)
Total unrealized net gains (losses) on available-for-sale securities		0	(209)	(2,320)	669
Unrealized net gains on cash flow hedges:
Amounts recognized in Other comprehensive (loss) income	[4]				(30,754)
Amounts reclassified from Other comprehensive (loss) income	[5]	(1,289)	(1,289)	(4,187)	(1,933)
Total unrealized net gains (losses) on cash flow hedges		(1,289)	(1,289)	(4,187)	(32,687)
Other comprehensive (loss) income		(68,147)	66,935	(225,726)	88,050
Comprehensive income		285,880	383,541	782,032	962,919
Pension and other postretirement benefit adjustment amounts reclassified in other comprehensive income, tax		(220)	(104)	285	(299)
Unrealized net gains (losses) on available-for-sale recognized in other comprehensive income, tax			(394)		(931)
Unrealized net gains (losses) on available-for-sale reclassified in other comprehensive income, tax			523	760	518
Unrealized net gains on cash flow hedges recognized in other comprehensive income, tax					18,895
Unrealized net gains on cash flow hedges reclassified in other comprehensive income, tax		$ 791	$ 792	$ 1,986	$ 1,188

[1] Net of taxes of $(220) and $(104) in the three months ended September 30, 2018 and 2017, respectively. Net of taxes of $285 and $(299) in the nine months ended September 30, 2018 and 2017, respectively.

[2] Net of taxes of $(394) in the three months ended September 30, 2017. Net of taxes of $(931) in the nine months ended September 30, 2017.

[3] Net of taxes of $523 in the three months ended September 30, 2017. Net of taxes of $760 and $518 in the nine months ended September 30, 2018 and 2017, respectively.

[4] Net of taxes of $18,895 in the nine months ended September 30, 2017.

[5] Net of taxes of $791 and $792 in the three months ended September 30, 2018 and 2017, respectively. Net of taxes of $1,986 and $1,188 in the nine months ended September 30, 2018 and 2017, respectively.