Investment Securities (Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale and Held to Maturity) (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Available for sale securities
Amortized Cost	$ 264,816,000,000	$ 391,482,000,000
Gross Unrealized Gains	2,000,000	3,481,000,000
Gross Unrealized Losses	28,301,000,000	4,909,000,000
Fair Value	236,517,000,000	390,054,000,000
Held to maturity securities
Amortized Cost	96,323,000,000
Gross Unrealized Gains	0
Gross Unrealized Losses	15,165,000,000
Fair Value	81,158,000,000
U.S. agency mortgage-backed securities [Member]
Available for sale securities
Amortized Cost	186,978,000,000	335,803,000,000
Gross Unrealized Gains	2,000,000	3,141,000,000
Gross Unrealized Losses	23,975,000,000	4,589,000,000
Fair Value	163,005,000,000	334,355,000,000
Held to maturity securities
Amortized Cost	96,323,000,000
Gross Unrealized Gains	0
Gross Unrealized Losses	15,165,000,000
Fair Value	81,158,000,000
U.S. Treasury securities [Member]
Available for sale securities
Amortized Cost	42,405,000,000	21,394,000,000
Gross Unrealized Gains	0	13,000,000
Gross Unrealized Losses	2,059,000,000	125,000,000
Fair Value	40,346,000,000	21,282,000,000
Asset-backed securities [Member]
Available for sale securities
Amortized Cost	15,472,000,000	17,547,000,000
Gross Unrealized Gains	0	79,000,000
Gross Unrealized Losses	652,000,000	80,000,000
Fair Value	14,820,000,000	17,546,000,000
Corporate debt securities [Member]
Available for sale securities
Amortized Cost	14,413,000,000	12,310,000,000
Gross Unrealized Gains	0	143,000,000
Gross Unrealized Losses	1,406,000,000	109,000,000
Fair Value	13,007,000,000	12,344,000,000
U.S. state and municipal securities [Member]
Available for sale securities
Amortized Cost	747,000,000	1,611,000,000
Gross Unrealized Gains	0	81,000,000
Gross Unrealized Losses	85,000,000	5,000,000
Fair Value	662,000,000	1,687,000,000
Non-agency commercial mortgage-backed securities [Member]
Available for sale securities
Amortized Cost	802,000,000	1,170,000,000
Gross Unrealized Gains	0	20,000,000
Gross Unrealized Losses	25,000,000	0
Fair Value	777,000,000	1,190,000,000
Certificates of deposit [Member]
Available for sale securities
Amortized Cost	2,545,000,000	1,000,000,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	21,000,000	1,000,000
Fair Value	2,524,000,000	999,000,000
Foreign government agency securities [Member]
Available for sale securities
Amortized Cost	1,132,000,000	425,000,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	68,000,000	0
Fair Value	1,064,000,000	425,000,000
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	287,000,000	0
Other [Member]
Available for sale securities
Amortized Cost	322,000,000	22,000,000
Gross Unrealized Gains	0	4,000,000
Gross Unrealized Losses	10,000,000	0
Fair Value	$ 312,000,000	$ 26,000,000
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Held to maturity securities
Asset-backed securities percentage	55.00%	58.00%
Collateralized Credit Card Securities [Member]
Held to maturity securities
Asset-backed securities percentage	18.00%	30.00%
Corporate debt securities issued by financial services industry [Member]
Held to maturity securities
AFS securities percentage	39.00%	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, 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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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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