Loans (Commercial Lending Asset Quality Indicators) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	$ 264,643	$ 239,843
Financing receivable, originated in 2020, % of total loans	4.60%
Financing receivable, originated in 2019, % of total loans	14.90%
Financing receivable, originated in 2018, % of total loans	9.80%
Financing receivable, originated in 2017, % of total loans	7.20%
Financing receivable, originated in 2016, % of total loans	5.20%
Prior, % of total loans	12.80%
Revolving Loans, % of total loans	45.50%
Revolving Loans Converted To Term, % of total loans	0.00%
Total Loans, % of total loans	100.00%
Total commercial lending
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	$ 8,508
Financing receivable, originated in 2019	27,455
Financing receivable, originated in 2018	18,125
Financing receivable, originated in 2017	13,275
Financing receivable, originated in 2016	9,559
Prior	23,686
Revolving Loans	84,051
Revolving Loans Converted to Term	77
Total Loans	184,736	160,602
Total commercial lending \| Commercial Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	7,266
Financing receivable, originated in 2019	19,068
Financing receivable, originated in 2018	12,537
Financing receivable, originated in 2017	8,378
Financing receivable, originated in 2016	5,706
Prior	12,337
Revolving Loans	83,762
Revolving Loans Converted to Term	77
Total Loans	$ 149,131	125,337
Financing receivable, originated in 2020, % of total loans	4.80%
Financing receivable, originated in 2019, % of total loans	12.80%
Financing receivable, originated in 2018, % of total loans	8.40%
Financing receivable, originated in 2017, % of total loans	5.60%
Financing receivable, originated in 2016, % of total loans	3.80%
Prior, % of total loans	8.30%
Revolving Loans, % of total loans	56.20%
Revolving Loans Converted To Term, % of total loans	0.10%
Total Loans, % of total loans	100.00%
Total commercial lending \| Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	$ 904
Financing receivable, originated in 2019	6,875
Financing receivable, originated in 2018	4,248
Financing receivable, originated in 2017	3,815
Financing receivable, originated in 2016	3,146
Prior	9,267
Revolving Loans	289
Total Loans	$ 28,544	28,110
Financing receivable, originated in 2020, % of total loans	3.20%
Financing receivable, originated in 2019, % of total loans	24.00%
Financing receivable, originated in 2018, % of total loans	14.90%
Financing receivable, originated in 2017, % of total loans	13.40%
Financing receivable, originated in 2016, % of total loans	11.00%
Prior, % of total loans	32.50%
Revolving Loans, % of total loans	1.00%
Total Loans, % of total loans	100.00%
Total commercial lending \| Equipment Lease Financing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	$ 338
Financing receivable, originated in 2019	1,512
Financing receivable, originated in 2018	1,340
Financing receivable, originated in 2017	1,082
Financing receivable, originated in 2016	707
Prior	2,082
Total Loans	$ 7,061	7,155
Financing receivable, originated in 2020, % of total loans	4.80%
Financing receivable, originated in 2019, % of total loans	21.40%
Financing receivable, originated in 2018, % of total loans	19.00%
Financing receivable, originated in 2017, % of total loans	15.30%
Financing receivable, originated in 2016, % of total loans	10.00%
Prior, % of total loans	29.50%
Total Loans, % of total loans	100.00%
Pass [Member] \| Total commercial lending
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		154,076
Pass [Member] \| Total commercial lending \| Commercial Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	$ 7,250
Financing receivable, originated in 2019	18,695
Financing receivable, originated in 2018	11,957
Financing receivable, originated in 2017	7,943
Financing receivable, originated in 2016	5,399
Prior	11,807
Revolving Loans	78,664
Revolving Loans Converted to Term	61
Total Loans	141,776	119,761
Pass [Member] \| Total commercial lending \| Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	898
Financing receivable, originated in 2019	6,812
Financing receivable, originated in 2018	4,221
Financing receivable, originated in 2017	3,766
Financing receivable, originated in 2016	2,973
Prior	8,908
Revolving Loans	203
Total Loans	27,781	27,424
Pass [Member] \| Total commercial lending \| Equipment Lease Financing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	334
Financing receivable, originated in 2019	1,438
Financing receivable, originated in 2018	1,252
Financing receivable, originated in 2017	1,038
Financing receivable, originated in 2016	680
Prior	2,059
Total Loans	6,801	6,891
Criticized [Member] \| Total commercial lending
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		6,526
Criticized [Member] \| Total commercial lending \| Commercial Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	16
Financing receivable, originated in 2019	373
Financing receivable, originated in 2018	580
Financing receivable, originated in 2017	435
Financing receivable, originated in 2016	307
Prior	530
Revolving Loans	5,098
Revolving Loans Converted to Term	16
Total Loans	7,355	5,576
Criticized [Member] \| Total commercial lending \| Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	6
Financing receivable, originated in 2019	63
Financing receivable, originated in 2018	27
Financing receivable, originated in 2017	49
Financing receivable, originated in 2016	173
Prior	359
Revolving Loans	86
Total Loans	763	686
Criticized [Member] \| Total commercial lending \| Equipment Lease Financing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	4
Financing receivable, originated in 2019	74
Financing receivable, originated in 2018	88
Financing receivable, originated in 2017	44
Financing receivable, originated in 2016	27
Prior	23
Total Loans	$ 260	$ 264

Financing Receivable, Originated Five or More Years before Latest Fiscal Year, Ratio Of Loans To Total Loans

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Financing Receivable, Originated Four Years before Latest Fiscal Year, Ratio Of Loans To Total Loans

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Financing Receivable, Originated Three Years before Latest Fiscal Year, Ratio Of Commercial Loans To Total Loans

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Financing Receivable, Originated Two Years before Latest Fiscal Year, Ratio Of Loans To Total Loans

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Financing Receivable, Originated in Current Fiscal Year, Ratio Of Loans To Total Loans

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Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year, Ratio Of Loans To Total Loans

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Financing Receivable, Revolving Loans Converted To Term

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Financing Receivable, Revolving Loans Converted To Term, Ratio Of Loans To Total Loans

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- Definition

Amount, after fee received for commitment to originate or purchase, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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- Definition

Amount of financing receivable originated five or more years prior to latest fiscal year.

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Amount of financing receivable originated four years prior to latest fiscal year.

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Amount of financing receivable originated in current fiscal year.

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Amount of financing receivable originated in fiscal year prior to latest fiscal year.

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Amount of financing receivable originated three years prior to latest fiscal year.

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Amount of financing receivable originated two years prior to latest fiscal year.

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Amount of financing receivable that can be withdrawn, repaid and redrawn.

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