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Business Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Reportable segments | segment	3
Net interest income and other financing income (loss)	$ 4,818	$ 5,320	$ 4,786
Provision for credit losses	487	553	271
Total Noninterest Income	2,265	2,256	2,429
Salaries and employee benefits	2,529	2,416	2,318
Equipment and software expense	406	412	392
Net occupancy expense	278	289	300
Other expenses	1,029	1,299	1,058
Total non-interest expense	4,242	4,416	4,068
Income before income taxes	2,354	2,607	2,876
Income tax expense (benefit)	461	533	631
Net income (loss)	1,893	2,074	2,245
Average assets	153,881	153,017	159,392
Service charges on deposit accounts
Segment Reporting Information [Line Items]
Total Noninterest Income	612	592	641
Card and ATM fees
Segment Reporting Information [Line Items]
Total Noninterest Income	467	504	513
Capital markets income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	348	222	339
Asset Management Income
Segment Reporting Information [Line Items]
Total Noninterest Income	338	313	297
Mortgage income
Segment Reporting Information [Line Items]
Total Noninterest Income	146	109	156
Investment Services Fee Income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	157	138	122
Commercial Credit Fee Income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	111	105	96
Bank-owned life insurance [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	102	78	62
Securities gains, net [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	(208)	(5)	(1)
Market value adjustments on employee benefit assets - other [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	25	15	(45)
Other miscellaneous income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	167	185	199
Insurance Proceeds
Segment Reporting Information [Line Items]
Total Noninterest Income			50
Corporate Bank [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	1,821	2,007	1,961
Provision for credit losses	362	343	287
Total Noninterest Income	897	712	803
Salaries and employee benefits	558	546	557
Equipment and software expense	19	20	23
Net occupancy expense	27	27	27
Other expenses	666	635	577
Total non-interest expense	1,270	1,228	1,184
Income before income taxes	1,086	1,148	1,293
Income tax expense (benefit)	271	287	323
Net income (loss)	815	861	970
Average assets	69,207	69,520	64,532
Corporate Bank [Member] | Service charges on deposit accounts
Segment Reporting Information [Line Items]
Total Noninterest Income	223	193	177
Corporate Bank [Member] | Card and ATM fees
Segment Reporting Information [Line Items]
Total Noninterest Income	43	45	44
Corporate Bank [Member] | Capital markets income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	346	219	339
Corporate Bank [Member] | Asset Management Income
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Corporate Bank [Member] | Mortgage income
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Corporate Bank [Member] | Investment Services Fee Income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Corporate Bank [Member] | Commercial Credit Fee Income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	111	105	96
Corporate Bank [Member] | Bank-owned life insurance [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Corporate Bank [Member] | Securities gains, net [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	(1)	0
Corporate Bank [Member] | Market value adjustments on employee benefit assets - other [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Corporate Bank [Member] | Other miscellaneous income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	174	151	147
Corporate Bank [Member] | Insurance Proceeds
Segment Reporting Information [Line Items]
Total Noninterest Income			0
Consumer Bank [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	2,834	3,123	2,641
Provision for credit losses	270	279	280
Total Noninterest Income	1,037	1,044	1,165
Salaries and employee benefits	721	732	733
Equipment and software expense	101	110	115
Net occupancy expense	210	222	222
Other expenses	1,369	1,509	1,226
Total non-interest expense	2,401	2,573	2,296
Income before income taxes	1,200	1,315	1,230
Income tax expense (benefit)	300	330	308
Net income (loss)	900	985	922
Average assets	37,947	37,762	36,623
Consumer Bank [Member] | Service charges on deposit accounts
Segment Reporting Information [Line Items]
Total Noninterest Income	385	396	459
Consumer Bank [Member] | Card and ATM fees
Segment Reporting Information [Line Items]
Total Noninterest Income	424	458	468
Consumer Bank [Member] | Capital markets income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	1	1	1
Consumer Bank [Member] | Asset Management Income
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Consumer Bank [Member] | Mortgage income
Segment Reporting Information [Line Items]
Total Noninterest Income	146	109	156
Consumer Bank [Member] | Investment Services Fee Income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Consumer Bank [Member] | Commercial Credit Fee Income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Consumer Bank [Member] | Bank-owned life insurance [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Consumer Bank [Member] | Securities gains, net [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Consumer Bank [Member] | Market value adjustments on employee benefit assets - other [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Consumer Bank [Member] | Other miscellaneous income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	81	80	81
Consumer Bank [Member] | Insurance Proceeds
Segment Reporting Information [Line Items]
Total Noninterest Income			0
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	163	190	184
Provision for credit losses	8	8	9
Total Noninterest Income	502	457	426
Salaries and employee benefits	260	254	236
Equipment and software expense	3	3	3
Net occupancy expense	12	12	13
Other expenses	178	158	152
Total non-interest expense	453	427	404
Income before income taxes	204	212	197
Income tax expense (benefit)	51	52	50
Net income (loss)	153	160	147
Average assets	2,063	2,044	2,116
Wealth Management [Member] | Service charges on deposit accounts
Segment Reporting Information [Line Items]
Total Noninterest Income	3	3	3
Wealth Management [Member] | Card and ATM fees
Segment Reporting Information [Line Items]
Total Noninterest Income	1	0	1
Wealth Management [Member] | Capital markets income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	1	1	1
Wealth Management [Member] | Asset Management Income
Segment Reporting Information [Line Items]
Total Noninterest Income	338	313	297
Wealth Management [Member] | Mortgage income
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Wealth Management [Member] | Investment Services Fee Income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	157	138	122
Wealth Management [Member] | Commercial Credit Fee Income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Wealth Management [Member] | Bank-owned life insurance [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Wealth Management [Member] | Securities gains, net [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Wealth Management [Member] | Market value adjustments on employee benefit assets - other [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Wealth Management [Member] | Other miscellaneous income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	2	2	2
Wealth Management [Member] | Insurance Proceeds
Segment Reporting Information [Line Items]
Total Noninterest Income			0
Other [Member]
Segment Reporting Information [Line Items]
Net interest income and other financing income (loss)	0	0	0
Provision for credit losses	(153)	(77)	(305)
Total Noninterest Income	(171)	43	35
Salaries and employee benefits	990	884	792
Equipment and software expense	283	279	251
Net occupancy expense	29	28	38
Other expenses	(1,184)	(1,003)	(897)
Total non-interest expense	118	188	184
Income before income taxes	(136)	(68)	156
Income tax expense (benefit)	(161)	(136)	(50)
Net income (loss)	25	68	206
Average assets	44,664	43,691	56,121
Other [Member] | Service charges on deposit accounts
Segment Reporting Information [Line Items]
Total Noninterest Income	1	0	2
Other [Member] | Card and ATM fees
Segment Reporting Information [Line Items]
Total Noninterest Income	(1)	1	0
Other [Member] | Capital markets income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	1	(2)
Other [Member] | Asset Management Income
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Other [Member] | Mortgage income
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Other [Member] | Investment Services Fee Income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Other [Member] | Commercial Credit Fee Income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	0	0	0
Other [Member] | Bank-owned life insurance [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	102	78	62
Other [Member] | Securities gains, net [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	(208)	(4)	(1)
Other [Member] | Market value adjustments on employee benefit assets - other [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	25	15	(45)
Other [Member] | Other miscellaneous income [Member]
Segment Reporting Information [Line Items]
Total Noninterest Income	(90)	(48)	(31)
Other [Member] | Insurance Proceeds
Segment Reporting Information [Line Items]
Total Noninterest Income			50
Other Revenue - Not Impacted [Member]
Segment Reporting Information [Line Items]
RevenueFromContractWithCustomerExcludingAssessedTax	$ 473	$ 534	$ 663

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