Investment Securities (Narrative) (Details)		3 Months Ended
	May 03, 2024 USD ($) shares	Mar. 31, 2024 USD ($) shares	Mar. 31, 2023 USD ($)	May 08, 2024 USD ($) Rate	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount		$ 6,988,000			$ 6,978,000
Percentage decrease requiring a review for impairment		20.00%
Fair value of securities on impairment watch list		$ 1,700,000,000			1,200,000,000
Debt Securities, Available-for-sale, Unrealized Loss Position		9,063,327,000			9,593,950,000
Unrealized Loss on AFS Debt Securities		1,247,618,000			1,220,484,000
AFS securities in loss position at period-end, change in unrealized loss		27,100,000
Securities pledged as collateral		$ 6,600,000,000			7,500,000,000
Number of investments in a single issuer that exceed 10% of stockholder's equity		0
No investment in a single issuer exceeds this percentage of stockholder's equity		10.00%
Subsequent Event [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Planned Sale, Amortized Cost				$ 1,000,000,000
Debt Securities, Available-for-Sale, Planned Sale, Yield | Rate				2.00%
Expected Loss on Available for Sale debt securities portfolio repositioning				$ 165,000,000
Debt Securities, Available-for-Sale, Planned Sale, Yield of Reinvestment | Rate				4.60%
U.S. government and federal agency obligations
Debt Securities, Available-for-sale [Line Items]
U.S. Treasury inflation-protected securities held, at fair value		$ 396,200,000
Debt Securities, Available-for-sale, Unrealized Loss Position		725,338,000			765,985,000
Unrealized Loss on AFS Debt Securities		23,020,000			$ 24,834,000
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Realized Gain (Loss)		(8,500,000)
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)		142,000	$ (127,000)
Other Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Other securities net loss on sale		969,000
Fair value other securities adjustments, net		$ 7,100,000	$ 2,251,000
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 | Subsequent Event [Member]
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 | Subsequent Event [Member]
Debt Securities, Available-for-sale [Line Items]
Exchange Offer, Conversion Rate of Common Stock	1.5875
Share Close Price	268.49
Visa Class C Shares | Subsequent Event [Member]
Debt Securities, Available-for-sale [Line Items]
Exchange Offer, Common Shares Received | shares	163,404
Exchange Offer, Gain on Investment	$ 175,500,000