Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Partners Capital [Abstract]
Net income	$ 495,460	$ 372,136	$ 1,400,778	$ 882,012
Other comprehensive income (loss), net of tax and reclassification adjustments:
Net unrealized gains (losses) on investment securities	(9,314)	(17,948)	(39,808)	114,451
Cash flow hedges adjustments	(38,038)	(63,199)	(152,175)	240,562
Foreign currency translation adjustments	(1,579)	2,733	(886)	(261)
Defined benefit plans liability adjustments	15,486	9,287	45,482	27,431
Total other comprehensive income (loss)	(33,445)	(69,127)	(147,387)	382,183
Total comprehensive income	$ 462,015	$ 303,009	$ 1,253,391	$ 1,264,195