Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Partners Capital [Abstract]
Net income	$ 458,069	$ 241,054	$ 905,318	$ 509,876
Other comprehensive income (loss), net of tax and reclassification adjustments:
Net unrealized gains (losses) on investment securities	(8,088)	34,951	(30,494)	132,399
Cash flow hedges adjustments	(47,360)	(8,959)	(114,137)	303,761
Foreign currency translation adjustments	145	(51)	693	(2,994)
Defined benefit plans liability adjustments	16,807	8,856	29,996	18,144
Total other comprehensive income (loss)	(38,496)	34,797	(113,942)	451,310
Total comprehensive income	$ 419,573	$ 275,851	$ 791,376	$ 961,186