Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Partners Capital [Abstract]
Net income	$ 447,249	$ 268,822
Other comprehensive income (loss), net of tax and reclassification adjustments:
Net unrealized gains (losses) on investment securities	(22,406)	97,448
Cash flow hedges adjustments	(66,777)	312,720
Foreign currency translation adjustments	548	(2,943)
Defined benefit plans liability adjustments	13,189	9,288
Total other comprehensive income (loss)	(75,446)	416,513
Total comprehensive income	$ 371,803	$ 685,335