Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Notional Amount	$ 446,953	$ 394,447
Derivative Asset, Fair Value	4,638	2,081
Derivative Liability, Fair Value	2,332	2,290
Derivative Asset, Fair Value Offset Amount	890	688
Derivative Liability, Fair Value Offset Amount	890	688
Derivative Asset, Cash Collateral	914	341
Derivative Liability, Cash Collateral	770	539
Derivative Asset, Net Fair Value	2,834	1,052
Derivative Liability, Net Fair Value	672	1,063
Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	381	311
Derivative Liability, Fair Value	377	305
Derivative Asset, Cash Collateral	58	210
Derivative Liability, Cash Collateral	2	17
Foreign Exchange And Other Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	363	269
Derivative Liability, Fair Value	445	465
Derivative Asset, Cash Collateral	8	14
Derivative Liability, Cash Collateral	46	33
Designated as Hedging Instruments under GAAP [Member]
Derivative [Line Items]
Derivative Notional Amount	55,998	49,268
Derivative Asset, Fair Value	48	8
Derivative Liability, Fair Value	4	10
Designated as Hedging Instruments under GAAP [Member] \| Fair Value Hedging [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	31,474	30,919
Derivative Asset, Fair Value		7
Designated as Hedging Instruments under GAAP [Member] \| Cash Flow Hedging [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	23,427	17,337
Derivative Asset, Fair Value	8	1
Derivative Liability, Fair Value	4
Designated as Hedging Instruments under GAAP [Member] \| Net Investment Hedging [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	1,097	1,012
Derivative Asset, Fair Value	40
Derivative Liability, Fair Value		10
Not Designated as Hedging Instrument under GAAP [Member]
Derivative [Line Items]
Derivative Notional Amount	390,955	345,179
Derivative Asset, Fair Value	4,590	2,073
Derivative Liability, Fair Value	2,328	2,280
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	73,386	66,022
Derivative Asset, Fair Value	160	57
Derivative Liability, Fair Value	128	45
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Swap [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	50,776	43,084
Derivative Asset, Fair Value	9
Derivative Liability, Fair Value	3	3
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Future [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	3,697	10,658
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Mortgage Commitment [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	12,046	5,771
Derivative Asset, Fair Value	97	47
Derivative Liability, Fair Value	85	39
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Other Contract [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	6,867	6,509
Derivative Asset, Fair Value	54	10
Derivative Liability, Fair Value	40	3
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	306,197	271,249
Derivative Asset, Fair Value	4,377	1,941
Derivative Liability, Fair Value	2,008	1,972
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	272,007	241,765
Derivative Asset, Fair Value	3,726	1,436
Derivative Liability, Fair Value	1,378	1,475
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	8,699	6,231
Derivative Asset, Fair Value	381	311
Derivative Liability, Fair Value	377	305
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Foreign Exchange And Other Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	25,491	23,253
Derivative Asset, Fair Value	270	194
Derivative Liability, Fair Value	253	192
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Swap [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	243,626	218,496
Derivative Asset, Fair Value	3,553	1,352
Derivative Liability, Fair Value	1,329	1,432
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Swap [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	4,619	4,813
Derivative Asset, Fair Value	242	244
Derivative Liability, Fair Value	239	238
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Future [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	704	914
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Mortgage Commitment [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	5,615	2,246
Derivative Asset, Fair Value	6	7
Derivative Liability, Fair Value	6	10
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Other Contract [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	22,062	20,109
Derivative Asset, Fair Value	167	77
Derivative Liability, Fair Value	43	33
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Other Contract [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	4,080	1,418
Derivative Asset, Fair Value	139	67
Derivative Liability, Fair Value	138	67
Not Designated as Hedging Instrument under GAAP [Member] \| Other Risk Management Activity [Member] \| Foreign Exchange And Other Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	11,372	7,908
Derivative Asset, Fair Value	53	75
Derivative Liability, Fair Value	$ 192	$ 263

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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