Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Partners' Capital [Abstract]
Net income	$ 336,031	$ 286,688	$ 634,559	$ 528,301
Other comprehensive income (loss), net of tax and reclassification adjustments:
Net unrealized gains (losses) on investment securities	47,270	(72,618)	144,464	(47,279)
Cash flow hedges adjustments	(23)	(24)	(47)	847
Foreign currency translation adjustment	(1,565)	1,866	(1,618)	(518)
Defined benefit plans liability adjustments	3,486	5,765	7,807	10,442
Total other comprehensive income (loss)	49,168	(65,011)	150,606	(36,508)
Total comprehensive income	$ 385,199	$ 221,677	$ 785,165	$ 491,793