Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Notional Amount	$ 426,932	$ 394,447
Derivative Asset, Fair Value	3,546	2,081
Derivative Liability, Fair Value	2,002	2,290
Derivative Asset, Fair Value Offset Amount	642	688
Derivative Liability, Fair Value Offset Amount	642	688
Derivative Asset, Cash Collateral	673	341
Derivative Liability, Cash Collateral	756	539
Derivative Asset, Net Fair Value	2,231	1,052
Derivative Liability, Net Fair Value	604	1,063
Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	221	311
Derivative Liability, Fair Value	217	305
Derivative Asset, Cash Collateral	32	210
Derivative Liability, Cash Collateral	1	17
Foreign Exchange And Other Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	213	269
Derivative Liability, Fair Value	402	465
Derivative Asset, Cash Collateral	3	14
Derivative Liability, Cash Collateral	60	33
Designated as Hedging Instruments under GAAP [Member]
Derivative [Line Items]
Derivative Notional Amount	57,825	49,268
Derivative Asset, Fair Value	9	8
Derivative Liability, Fair Value	1	10
Designated as Hedging Instruments under GAAP [Member] \| Fair Value Hedging [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	31,914	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	24,859	17,337
Derivative Asset, Fair Value	6	1
Derivative Liability, Fair Value	1
Designated as Hedging Instruments under GAAP [Member] \| Net Investment Hedging [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	1,052	1,012
Derivative Asset, Fair Value	3
Derivative Liability, Fair Value		10
Not Designated as Hedging Instrument under GAAP [Member]
Derivative [Line Items]
Derivative Notional Amount	369,107	345,179
Derivative Asset, Fair Value	3,537	2,073
Derivative Liability, Fair Value	2,001	2,280
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	68,808	66,022
Derivative Asset, Fair Value	149	57
Derivative Liability, Fair Value	116	45
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Swap [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	48,118	43,084
Derivative Asset, Fair Value	12
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	3,763	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	8,478	5,771
Derivative Asset, Fair Value	92	47
Derivative Liability, Fair Value	88	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	8,449	6,509
Derivative Asset, Fair Value	45	10
Derivative Liability, Fair Value	25	3
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	290,550	271,249
Derivative Asset, Fair Value	3,357	1,941
Derivative Liability, Fair Value	1,652	1,972
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	259,186	241,765
Derivative Asset, Fair Value	2,957	1,436
Derivative Liability, Fair Value	1,266	1,475
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	5,870	6,231
Derivative Asset, Fair Value	221	311
Derivative Liability, Fair Value	217	305
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Foreign Exchange And Other Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	25,494	23,253
Derivative Asset, Fair Value	179	194
Derivative Liability, Fair Value	169	192
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Swap [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	233,046	218,496
Derivative Asset, Fair Value	2,812	1,352
Derivative Liability, Fair Value	1,216	1,432
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Swap [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	4,323	4,813
Derivative Asset, Fair Value	204	244
Derivative Liability, Fair Value	200	238
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Future [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	587	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	3,345	2,246
Derivative Asset, Fair Value	7	7
Derivative Liability, Fair Value	9	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	22,208	20,109
Derivative Asset, Fair Value	138	77
Derivative Liability, Fair Value	41	33
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Other Contract [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	1,547	1,418
Derivative Asset, Fair Value	17	67
Derivative Liability, Fair Value	17	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	9,749	7,908
Derivative Asset, Fair Value	31	75
Derivative Liability, Fair Value	$ 233	$ 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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The amount of setoff associated with the entity's recognized derivative assets with corresponding derivative liability amounts subject to an enforceable master netting agreement or similar agreement.

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The amount of setoff associated with the entity's recognized derivative liabilities with corresponding derivative asset amounts subject to an enforceable master netting agreement or similar agreement.

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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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