Derivative And Credit-Related Financial Instruments (Schedule Of Derivative Instruments) (Details) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	$ 67,381	$ 41,638
Fair Value of Gross Derivative Assets		1,617	928
Fair Value of Gross Derivative Liabilities		2,131	747
Derivative assets, Netting adjustment - Offsetting derivative liabilities		(785)	(187)
Derivative liabilities, Netting adjustment - Offsetting derivative assets		(785)	(187)
Derivative assets, Netting adjustment - Cash collateral received		(194)	(15)
Derivative liabilities, Netting adjustment, Cash collateral posted		(277)	(452)
Net derivative assets included in the Consolidated Balance Sheets	[2]	638	726
Net derivative liabilities included in the Consolidated Balance Sheets	[2]	1,069	108
Derivative asset, securities pledged as collateral		(28)	0
Derivative liability, securities pledged as collateral		(128)	(52)
Net derivative assets after deducting amounts not offset in the Consolidated Balance Sheets		610	726
Net derivative liabilities after deducting amounts not offset in the Consolidated Balance Sheets		941	56
Credit valuation adjustments for counterparty credit risk		3	9
Risk management purposes
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	29,710	11,152
Fair Value of Gross Derivative Assets		4	0
Fair Value of Gross Derivative Liabilities		112	2
Risk management purposes | Derivatives designated as hedging instruments | Swaps - fair value - receive fixed/pay floating | Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	3,150	2,650
Fair Value of Gross Derivative Assets		0	0
Fair Value of Gross Derivative Liabilities		0	0
Risk management purposes | Derivatives designated as hedging instruments | Swaps - cash flow - receive fixed/pay floating rate | Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1],[3]	26,100	8,050
Fair Value of Gross Derivative Assets	[3]	0	0
Fair Value of Gross Derivative Liabilities	[3]	109	0
Risk management purposes | Derivatives used as economic hedges | Foreign exchange spot, forwards and swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	460	452
Fair Value of Gross Derivative Assets		4	0
Fair Value of Gross Derivative Liabilities		3	2
Customer-initiated and other activities
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	37,671	30,486
Fair Value of Gross Derivative Assets		1,613	928
Fair Value of Gross Derivative Liabilities		2,019	745
Customer-initiated and other activities | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	20,471	21,000
Fair Value of Gross Derivative Assets		212	239
Fair Value of Gross Derivative Liabilities		632	69
Customer-initiated and other activities | Interest rate caps and floors written
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	924	809
Fair Value of Gross Derivative Assets		0	0
Fair Value of Gross Derivative Liabilities		23	3
Customer-initiated and other activities | Interest rate caps and floors purchased
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	924	809
Fair Value of Gross Derivative Assets		23	3
Fair Value of Gross Derivative Liabilities		0	0
Customer-initiated and other activities | Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	18,623	19,382
Fair Value of Gross Derivative Assets		189	236
Fair Value of Gross Derivative Liabilities		609	66
Customer-initiated and other activities | Energy contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	14,742	7,770
Fair Value of Gross Derivative Assets		1,325	670
Fair Value of Gross Derivative Liabilities		1,316	662
Customer-initiated and other activities | Energy caps and floors written
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	4,076	1,779
Fair Value of Gross Derivative Assets		0	0
Fair Value of Gross Derivative Liabilities		544	203
Customer-initiated and other activities | Energy caps and floors purchased
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	4,076	1,779
Fair Value of Gross Derivative Assets		544	204
Fair Value of Gross Derivative Liabilities		0	0
Customer-initiated and other activities | Energy swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	6,590	4,212
Fair Value of Gross Derivative Assets		781	466
Fair Value of Gross Derivative Liabilities		772	459
Customer-initiated and other activities | Foreign exchange spot, forwards, options and swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	2,458	1,716
Fair Value of Gross Derivative Assets		76	19
Fair Value of Gross Derivative Liabilities		$ 71	$ 14

[1] Notional or contractual amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the Consolidated Balance Sheets.

[2] Net derivative assets are included in accrued income and other assets and net derivative liabilities are included in accrued expenses and other liabilities on the Consolidated Balance Sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and credit risk of the Corporation. The fair value of net derivative assets included credit valuation adjustments for counterparty credit risk of $3 million and $9 million at September 30, 2022 and December 31, 2021, respectively.

[3] September 30, 2022 included $10.8 billion of forward starting swaps that will become effective on their contractual start dates in 2022, 2023 and 2024.