Investment Securities (Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale and Held to Maturity) (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2020
Available for sale securities
Amortized Cost	$ 160,162,000,000	$ 391,482,000,000
Gross Unrealized Gains	0	3,481,000,000
Gross Unrealized Losses	12,291,000,000	4,909,000,000
Fair Value	147,871,000,000	390,054,000,000
Held to maturity securities
Amortized Cost	173,074,000,000		$ 134,700,000,000
Gross Unrealized Gains	1,442,000,000		$ 1,400,000,000
Gross Unrealized Losses	15,580,000,000
Fair Value	158,936,000,000
U.S. agency mortgage-backed securities [Member]
Available for sale securities
Amortized Cost	85,994,000,000	335,803,000,000
Gross Unrealized Gains	0	3,141,000,000
Gross Unrealized Losses	8,306,000,000	4,589,000,000
Fair Value	77,688,000,000	334,355,000,000
Held to maturity securities
Amortized Cost	173,074,000,000
Gross Unrealized Gains	1,442,000,000
Gross Unrealized Losses	15,580,000,000
Fair Value	158,936,000,000
U.S. Treasury securities [Member]
Available for sale securities
Amortized Cost	41,879,000,000	21,394,000,000
Gross Unrealized Gains	0	13,000,000
Gross Unrealized Losses	1,877,000,000	125,000,000
Fair Value	40,002,000,000	21,282,000,000
Asset-backed securities [Member]
Available for sale securities
Amortized Cost	13,672,000,000	17,547,000,000
Gross Unrealized Gains	0	79,000,000
Gross Unrealized Losses	649,000,000	80,000,000
Fair Value	13,023,000,000	17,546,000,000
Corporate debt securities [Member]
Available for sale securities
Amortized Cost	13,830,000,000	12,310,000,000
Gross Unrealized Gains	0	143,000,000
Gross Unrealized Losses	1,275,000,000	109,000,000
Fair Value	12,555,000,000	12,344,000,000
Certificates of deposit [Member]
Available for sale securities
Amortized Cost	2,245,000,000	1,000,000,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	14,000,000	1,000,000
Fair Value	2,231,000,000	999,000,000
Foreign government agency securities [Member]
Available for sale securities
Amortized Cost	1,033,000,000	425,000,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	64,000,000	0
Fair Value	969,000,000	425,000,000
U.S. state and municipal securities [Member]
Available for sale securities
Amortized Cost	713,000,000	1,611,000,000
Gross Unrealized Gains	0	81,000,000
Gross Unrealized Losses	75,000,000	5,000,000
Fair Value	638,000,000	1,687,000,000
Non-agency commercial mortgage-backed securities [Member]
Available for sale securities
Amortized Cost	473,000,000	1,170,000,000
Gross Unrealized Gains	0	20,000,000
Gross Unrealized Losses	23,000,000	0
Fair Value	450,000,000	1,190,000,000
Commercial paper [Member]
Available for sale securities
Amortized Cost		200,000,000
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		200,000,000
Commercial paper [Member] \| Cash and Cash Equivalents
Available for sale securities
Fair Value	48,000,000	0
Other [Member]
Available for sale securities
Amortized Cost	323,000,000	22,000,000
Gross Unrealized Gains	0	4,000,000
Gross Unrealized Losses	8,000,000	0
Fair Value	$ 315,000,000	$ 26,000,000
Federal Family Education Loan Program Asset-Backed Securities [Member]
Held to maturity securities
Asset-backed securities percent	57.00%	58.00%
Collateralized credit card receivables [Member]
Held to maturity securities
Asset-backed securities percent	18.00%	30.00%
Corporate debt securities issued by financial services industry [Member]
Held to maturity securities
AFS securities percentage	37.00%	31.00%

Concentration Risk, Asset-Backed Securities

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Concentration Risk, Available-For-Sale

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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