Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Notional Amount	$ 403,487	$ 394,447
Derivative Asset, Fair Value	2,368	2,081
Derivative Liability, Fair Value	1,905	2,290
Derivative Asset, Fair Value Offset Amount	695	688
Derivative Liability, Fair Value Offset Amount	695	688
Derivative Asset, Cash Collateral	302	341
Derivative Asset, Net Fair Value	1,371	1,052
Derivative Liability, Cash Collateral	626	539
Derivative Liability, Net Fair Value	584	1,063
Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	159	311
Derivative Liability, Fair Value	154	305
Derivative Asset, Cash Collateral	1	210
Derivative Liability, Cash Collateral	39	17
Foreign Exchange And Other Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	226	269
Derivative Liability, Fair Value	431	465
Derivative Asset, Cash Collateral	6	14
Derivative Liability, Cash Collateral	50	33
Designated as Hedging Instruments under GAAP [Member]
Derivative [Line Items]
Derivative Notional Amount	53,655	49,268
Derivative Asset, Fair Value	10	8
Derivative Liability, Fair Value	29	10
Designated as Hedging Instruments under GAAP [Member] \| Fair Value Hedging [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	30,701	30,919
Derivative Asset, Fair Value	7	7
Designated as Hedging Instruments under GAAP [Member] \| Cash Flow Hedging [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	21,946	17,337
Derivative Asset, Fair Value	3	1
Designated as Hedging Instruments under GAAP [Member] \| Net Investment Hedging [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	1,008	1,012
Derivative Liability, Fair Value	29	10
Not Designated as Hedging Instrument under GAAP [Member]
Derivative [Line Items]
Derivative Notional Amount	349,832	345,179
Derivative Asset, Fair Value	2,358	2,073
Derivative Liability, Fair Value	1,876	2,280
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	62,026	66,022
Derivative Asset, Fair Value	104	57
Derivative Liability, Fair Value	73	45
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Swap [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	41,334	43,084
Derivative Asset, Fair Value	14
Derivative Liability, Fair Value	4	3
Not Designated as Hedging Instrument under GAAP [Member] \| Mortgage Banking [Member] \| Future [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	4,535	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	6,277	5,771
Derivative Asset, Fair Value	64	47
Derivative Liability, Fair Value	57	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	9,880	6,509
Derivative Asset, Fair Value	26	10
Derivative Liability, Fair Value	12	3
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	279,095	271,249
Derivative Asset, Fair Value	2,214	1,941
Derivative Liability, Fair Value	1,581	1,972
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	249,464	241,765
Derivative Asset, Fair Value	1,869	1,436
Derivative Liability, Fair Value	1,247	1,475
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	6,007	6,231
Derivative Asset, Fair Value	159	311
Derivative Liability, Fair Value	154	305
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Foreign Exchange And Other Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	23,624	23,253
Derivative Asset, Fair Value	186	194
Derivative Liability, Fair Value	180	192
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Swap [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	224,133	218,496
Derivative Asset, Fair Value	1,780	1,352
Derivative Liability, Fair Value	1,213	1,432
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Swap [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	4,620	4,813
Derivative Asset, Fair Value	144	244
Derivative Liability, Fair Value	139	238
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Future [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Notional Amount	564	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	2,708	2,246
Derivative Asset, Fair Value	6	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	22,059	20,109
Derivative Asset, Fair Value	83	77
Derivative Liability, Fair Value	25	33
Not Designated as Hedging Instrument under GAAP [Member] \| Customer Contracts [Member] \| Other Contract [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Notional Amount	1,387	1,418
Derivative Asset, Fair Value	15	67
Derivative Liability, Fair Value	15	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	8,711	7,908
Derivative Asset, Fair Value	40	75
Derivative Liability, Fair Value	$ 222	$ 263

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
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Fair value of the gross assets less the offsetting amount of derivative assets.

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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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Fair value of the gross liabilities less the amount of offsetting amount of derivative liabilities.

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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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