Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, Notional Amount	$ 394,447	$ 418,625
Derivative Asset, Fair Value	2,081	2,874
Derivative Liability, Fair Value	2,290	2,856
Derivative Asset, Fair Value Offset Amount	688	1,054
Derivative Asset, Cash Collateral	341	636
Derivative Asset, Net Fair Value	1,052	1,184
Derivative Liability, Fair Value Offset Amount	688	1,054
Derivative Liability, Cash Collateral	539	763
Derivative Liability, Net Fair Value	1,063	1,039
Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	49,268	58,994
Derivative Asset, Fair Value	8	174
Derivative Liability, Fair Value	10	111
Designated as Hedging Instrument \| Fair Value Hedging \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	30,919	34,059
Derivative Asset, Fair Value	7	114
Derivative Liability, Fair Value		94
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	17,337	23,875
Derivative Asset, Fair Value	1	60
Derivative Liability, Fair Value		6
Designated as Hedging Instrument \| Net Investment Hedging \| Foreign Exchange Contract
Derivative [Line Items]
Derivative, Notional Amount	1,012	1,060
Derivative Asset, Fair Value
Derivative Liability, Fair Value	10	11
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Notional Amount	345,179	359,631
Derivative Asset, Fair Value	2,073	2,700
Derivative Liability, Fair Value	2,280	2,745
Not Designated as Hedging Instrument \| Mortgage Banking \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	66,022	107,358
Derivative Asset, Fair Value	57	192
Derivative Liability, Fair Value	45	53
Not Designated as Hedging Instrument \| Mortgage Banking \| Swap \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	43,084	48,335
Derivative Asset, Fair Value		162
Derivative Liability, Fair Value	3	42
Not Designated as Hedging Instrument \| Mortgage Banking \| Future \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	10,658	47,494
Not Designated as Hedging Instrument \| Mortgage Banking \| Mortgage Commitment \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	5,771	8,999
Derivative Asset, Fair Value	47	19
Derivative Liability, Fair Value	39	9
Not Designated as Hedging Instrument \| Mortgage Banking \| Other Contract \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	6,509	2,530
Derivative Asset, Fair Value	10	11
Derivative Liability, Fair Value	3	2
Not Designated as Hedging Instrument \| Customer Contracts
Derivative [Line Items]
Derivative, Notional Amount	271,249	244,828
Derivative Asset, Fair Value	1,941	2,505
Derivative Liability, Fair Value	1,972	2,142
Not Designated as Hedging Instrument \| Customer Contracts \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	241,765	217,498
Derivative Asset, Fair Value	1,436	2,156
Derivative Liability, Fair Value	1,475	1,810
Not Designated as Hedging Instrument \| Customer Contracts \| Commodity Contracts
Derivative [Line Items]
Derivative, Notional Amount	6,231	4,207
Derivative Asset, Fair Value	311	130
Derivative Liability, Fair Value	305	126
Not Designated as Hedging Instrument \| Customer Contracts \| Foreign Exchange And Other Contract
Derivative [Line Items]
Derivative, Notional Amount	23,253	23,123
Derivative Asset, Fair Value	194	219
Derivative Liability, Fair Value	192	206
Not Designated as Hedging Instrument \| Customer Contracts \| Swap \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	218,496	194,042
Derivative Asset, Fair Value	1,352	2,079
Derivative Liability, Fair Value	1,432	1,772
Not Designated as Hedging Instrument \| Customer Contracts \| Swap \| Commodity Contracts
Derivative [Line Items]
Derivative, Notional Amount	4,813	3,339
Derivative Asset, Fair Value	244	108
Derivative Liability, Fair Value	238	104
Not Designated as Hedging Instrument \| Customer Contracts \| Future \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	914	3,453
Not Designated as Hedging Instrument \| Customer Contracts \| Mortgage Commitment \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	2,246	2,228
Derivative Asset, Fair Value	7	2
Derivative Liability, Fair Value	10	2
Not Designated as Hedging Instrument \| Customer Contracts \| Other Contract \| Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount	20,109	17,775
Derivative Asset, Fair Value	77	75
Derivative Liability, Fair Value	33	36
Not Designated as Hedging Instrument \| Customer Contracts \| Other Contract \| Commodity Contracts
Derivative [Line Items]
Derivative, Notional Amount	1,418	868
Derivative Asset, Fair Value	67	22
Derivative Liability, Fair Value	67	22
Not Designated as Hedging Instrument \| Other Risk Management Activity \| Foreign Exchange And Other Contract
Derivative [Line Items]
Derivative, Notional Amount	7,908	7,445
Derivative Asset, Fair Value	75	3
Derivative Liability, Fair Value	$ 263	$ 550

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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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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