Loans and Related Allowance for Credit Losses (Commercial Lending Asset Quality Indicators) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	$ 258,236	$ 239,843
Total commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	27,040
Financing receivable, originated in 2019	26,275
Financing receivable, originated in 2018	16,835
Financing receivable, originated in 2017	12,358
Financing receivable, originated in 2016	8,896
Prior	22,265
Revolving Loans	66,450
Revolving Loans Converted to Term	76
Total Loans	180,195	160,602
Total commercial \| Commercial and industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	24,489
Financing receivable, originated in 2019	17,703
Financing receivable, originated in 2018	11,479
Financing receivable, originated in 2017	7,634
Financing receivable, originated in 2016	5,260
Prior	11,556
Revolving Loans	66,138
Revolving Loans Converted to Term	76
Total Loans	144,335	125,337
Total commercial \| Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	1,800
Financing receivable, originated in 2019	7,100
Financing receivable, originated in 2018	4,080
Financing receivable, originated in 2017	3,716
Financing receivable, originated in 2016	2,986
Prior	8,769
Revolving Loans	312
Revolving Loans Converted to Term
Total Loans	28,763	28,110
Total commercial \| Equipment Lease Financing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	751
Financing receivable, originated in 2019	1,472
Financing receivable, originated in 2018	1,276
Financing receivable, originated in 2017	1,008
Financing receivable, originated in 2016	650
Prior	1,940
Total Loans	7,097	7,155
Pass [Member] \| Total commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		154,076
Pass [Member] \| Total commercial \| Commercial and industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	24,271
Financing receivable, originated in 2019	17,179
Financing receivable, originated in 2018	10,823
Financing receivable, originated in 2017	7,171
Financing receivable, originated in 2016	5,013
Prior	11,039
Revolving Loans	60,961
Revolving Loans Converted to Term	59
Total Loans	136,516	119,761
Pass [Member] \| Total commercial \| Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	1,797
Financing receivable, originated in 2019	7,027
Financing receivable, originated in 2018	4,054
Financing receivable, originated in 2017	3,652
Financing receivable, originated in 2016	2,734
Prior	8,347
Revolving Loans	216
Total Loans	27,827	27,424
Pass [Member] \| Total commercial \| Equipment Lease Financing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	736
Financing receivable, originated in 2019	1,385
Financing receivable, originated in 2018	1,179
Financing receivable, originated in 2017	969
Financing receivable, originated in 2016	631
Prior	1,909
Total Loans	6,809	6,891
Criticized [Member] \| Total commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans		6,526
Criticized [Member] \| Total commercial \| Commercial and industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	218
Financing receivable, originated in 2019	524
Financing receivable, originated in 2018	656
Financing receivable, originated in 2017	463
Financing receivable, originated in 2016	247
Prior	517
Revolving Loans	5,177
Revolving Loans Converted to Term	17
Total Loans	7,819	5,576
Criticized [Member] \| Total commercial \| Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	3
Financing receivable, originated in 2019	73
Financing receivable, originated in 2018	26
Financing receivable, originated in 2017	64
Financing receivable, originated in 2016	252
Prior	422
Revolving Loans	96
Total Loans	936	686
Criticized [Member] \| Total commercial \| Equipment Lease Financing [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, originated in 2020	15
Financing receivable, originated in 2019	87
Financing receivable, originated in 2018	97
Financing receivable, originated in 2017	39
Financing receivable, originated in 2016	19
Prior	31
Total Loans	$ 288	$ 264

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