Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details 4) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			$ 4,908,619
Other comprehensive income (loss), net of tax	$ (46,719)	$ (56,331)	(99,085)	$ (83,918)
Balance at the end of the period	4,502,313		4,502,313
Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			77,522	216,140
Other comprehensive income (loss) before reclassifications, net of tax			(105,252)	(80,698)
Amounts reclassified from accumulated other comprehensive income (loss)			6,167	(3,220)
Other comprehensive income (loss), net of tax			(99,085)	(83,918)
Balance at the end of the period	(21,563)	132,222	(21,563)	132,222
Gains (losses) on cash flow hedges
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			(2,044)	(2,419)
Amounts reclassified from accumulated other comprehensive income (loss)			280	280
Other comprehensive income (loss), net of tax			280	280
Balance at the end of the period	(1,764)	(2,139)	(1,764)	(2,139)
Unrealized gains (losses) on available-for-sale securities.
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			14,996	71,742
Other comprehensive income (loss) before reclassifications, net of tax			(10,127)	(34,646)
Amounts reclassified from accumulated other comprehensive income (loss)				(3,726)
Other comprehensive income (loss), net of tax			(10,127)	(38,372)
Balance at the end of the period	4,869	33,370	4,869	33,370
Defined benefit pension plan items
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			(7,263)	(4,075)
Amounts reclassified from accumulated other comprehensive income (loss)			522	226
Other comprehensive income (loss), net of tax			522	226
Balance at the end of the period	(6,741)	(3,849)	(6,741)	(3,849)
Foreign currency items
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			71,833	150,892
Other comprehensive income (loss) before reclassifications, net of tax			(95,125)	(46,052)
Amounts reclassified from accumulated other comprehensive income (loss)			5,365
Other comprehensive income (loss), net of tax			(89,760)	(46,052)
Balance at the end of the period	$ (17,927)	$ 104,840	$ (17,927)	$ 104,840