Investment Securities (Narrative) (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2024 USD ($) $ / shares Rate shares	Jun. 30, 2024 USD ($) $ / shares Rate shares	Jun. 30, 2023 USD ($)	May 03, 2024 USD ($) shares	Mar. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Proceeds from Sale of Equity Securities	$ 119,800,000
Equity Securities without Readily Determinable Fair Value, Amount	65,780,000	$ 65,780,000			$ 6,988,000	$ 6,978,000
Percentage decrease requiring a review for impairment		20.00%
Fair value of securities on impairment watch list	1,800,000,000	$ 1,800,000,000				1,200,000,000
Debt Securities, Available-for-sale, Unrealized Loss Position	7,982,868,000	7,982,868,000				9,593,950,000
Unrealized Loss on AFS Debt Securities	1,076,042,000	1,076,042,000				1,220,484,000
AFS securities in loss position at period-end, change in unrealized loss		(144,400,000)
Debt Securities, Available-for-Sale, Planned Sale, Amortized Cost	$ 1,200,000,000	$ 1,200,000,000
Debt Securities, Available-for-Sale, Planned Sale, Yield | Rate	2.10%	2.10%
Loss on Available for Sale debt securities portfolio repositioning	$ 179,100,000	$ 179,100,000
Debt Securities, Available-for-Sale, Planned Sale, Reinvestment	$ 928,800,000	$ 928,800,000
Debt Securities, Available-for-Sale, Planned Sale, Yield of Reinvestment | Rate	4.60%	4.60%
Securities pledged as collateral	$ 6,500,000,000	$ 6,500,000,000				7,500,000,000
Number of investments in a single issuer that exceed 10% of stockholder's equity	0	0
No investment in a single issuer exceeds this percentage of stockholder's equity	10.00%	10.00%
U.S. government and federal agency obligations
Debt Securities, Available-for-sale [Line Items]
U.S. Treasury inflation-protected securities held, at fair value	$ 399,700,000	$ 399,700,000
Debt Securities, Available-for-sale, Unrealized Loss Position	1,156,883,000	1,156,883,000				765,985,000
Unrealized Loss on AFS Debt Securities	25,144,000	25,144,000				$ 24,834,000
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Losses realized on sales		187,543,000	$ 8,587,000
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Gain (Loss)	$ 178,164,000	178,306,000	(690,000)
Other Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value other securities adjustments, net		$ 12,777,000	$ 11,341,000
Visa Class B-1 Shares
Debt Securities, Available-for-sale [Line Items]
Equity Securities without Readily Determinable Fair Value, Shares | shares					823,447
Exchange Offer, Original Shares Held | shares					823,447
Visa Class B-2 Shares
Debt Securities, Available-for-sale [Line Items]
Exchange Offer, Common Shares Received | shares				411,723
Equity Securities without Readily Determinable Fair Value, Amount				$ 0
Visa Class A Shares
Debt Securities, Available-for-sale [Line Items]
Exchange Offer, Conversion Rate of Common Stock				1.5875
Equity Securities Sold, Shares | shares	436,000	436,000
Equity Securities Sold, Average Price | $ / shares	$ 274.91	$ 274.91
Visa Class C Shares
Debt Securities, Available-for-sale [Line Items]
Exchange Offer, Common Shares Received | shares				163,404
Equity Securities Held, Shares | shares	54,000	54,000
Equity Securities without Readily Determinable Fair Value, Amount	$ 57,200,000	$ 57,200,000