Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Partners' Capital [Abstract]
Net income	$ 275,344	$ 294,479	$ 788,697	$ 917,058
Other comprehensive income (loss), net of tax and reclassification adjustments:
Net unrealized gains (losses) on investment securities	(27,637)	23,367	75,229	26,724
Reclassification to income for amortization of gains on terminated cash flow hedges	613		(98)
Foreign currency translation adjustment	(1,817)	1,251	(1,504)	205
Defined benefit plans liability adjustment	1,000	5,091	2,999	15,273
Total other comprehensive income (loss)	(27,841)	29,709	76,626	42,202
Total comprehensive income	$ 247,503	$ 324,188	$ 865,323	$ 959,260