Derivative Financial Instruments - Classifications and Hedging Relationships (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	$ 64,967	$ 67,738
Fair Value, Gain	656	246
Fair Value, Loss	(167)	(247)
Derivative Asset [Abstract]
Amounts subject to master netting arrangements	(57)
Amounts subject to master netting arrangements		(47)
Cash collateral (received) posted for amounts subject to master netting arrangements	(101)
Cash collateral (received) posted for amounts subject to master netting arrangements		(53)
Net amount	498	146
Derivative Asset, Not Subject to Master Netting Arrangement	497	144
Derivative Liability [Abstract]
Amounts subject to master netting arrangements	57
Amounts subject to master netting arrangements not offset due to policy election		47
Cash collateral (received) posted for amounts subject to master netting arrangements	75
Cash collateral (received) posted for amounts subject to master netting arrangements		82
Net amount	(35)	(118)
Derivative instruments not under master netting agreements	(26)	(116)
Derivatives Subject to Master Netting Arrangements
Derivative Asset [Abstract]
Derivative instruments under master netting arrangements	159	102
Derivative Liability [Abstract]
Derivative instruments under master netting arrangements	(141)	(131)
Cash flow hedges \| Interest rate contracts \| Pay fixed swaps \| 3 mo. LIBOR funding
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	2,500	6,500
Fair Value, Gain	0	0
Fair Value, Loss	0	0
Fair value hedges \| Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	16,884	18,457
Fair Value, Gain	108	7
Fair Value, Loss	(27)	(76)
Fair value hedges \| Interest rate contracts \| Pay fixed swaps \| Commercial loans
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	419	505
Fair Value, Gain	0	2
Fair Value, Loss	0	0
Fair value hedges \| Interest rate contracts \| Pay fixed swaps \| Municipal securities
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	151	259
Fair Value, Gain	0	0
Fair Value, Loss	0	0
Fair value hedges \| Interest rate contracts \| Receive fixed swaps \| Long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	11,529	12,908
Fair Value, Gain	108	5
Fair Value, Loss	(25)	(74)
Fair value hedges \| Interest rate contracts \| Options \| Long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	4,785	4,785
Fair Value, Gain	0	0
Fair Value, Loss	(2)	(2)
Not designated as hedges
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	45,583	42,781
Fair Value, Gain	548	239
Fair Value, Loss	(140)	(171)
Not designated as hedges \| Client-related and other risk management
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	32,440	27,655
Fair Value, Gain	495	165
Fair Value, Loss	(107)	(148)
Not designated as hedges \| Client-related and other risk management \| Interest rate contracts \| Pay fixed swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	12,520	11,523
Fair Value, Gain	1	19
Fair Value, Loss	(68)	(32)
Not designated as hedges \| Client-related and other risk management \| Interest rate contracts \| Receive fixed swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	12,709	11,577
Fair Value, Gain	471	128
Fair Value, Loss	(6)	(98)
Not designated as hedges \| Client-related and other risk management \| Interest rate contracts \| Other
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	1,342	1,143
Fair Value, Gain	2	2
Fair Value, Loss	(3)	(3)
Not designated as hedges \| Client-related and other risk management \| Interest rate contracts \| Forward commitments
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	5,345	2,883
Fair Value, Gain	20	11
Fair Value, Loss	(27)	(13)
Not designated as hedges \| Client-related and other risk management \| Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	524	529
Fair Value, Gain	1	5
Fair Value, Loss	(3)	(2)
Not designated as hedges \| Mortgage banking \| Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	4,174	2,726
Fair Value, Gain	21	16
Fair Value, Loss	(29)	(21)
Not designated as hedges \| Mortgage banking \| Interest rate contracts \| Interest rate lock commitments
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	1,779	702
Fair Value, Gain	18	12
Fair Value, Loss	(1)	0
Not designated as hedges \| Mortgage banking \| Interest rate contracts \| When issued securities, forward rate agreements and forward commitments
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	2,339	1,753
Fair Value, Gain	3	2
Fair Value, Loss	(28)	(20)
Not designated as hedges \| Mortgage banking \| Interest rate contracts \| Other
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	56	271
Fair Value, Gain	0	2
Fair Value, Loss	0	(1)
Not designated as hedges \| MSRs \| Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	8,969	12,400
Fair Value, Gain	32	58
Fair Value, Loss	(4)	(2)
Not designated as hedges \| MSRs \| Interest rate contracts \| Pay fixed swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	2,442	3,224
Fair Value, Gain	1	0
Fair Value, Loss	0	0
Not designated as hedges \| MSRs \| Interest rate contracts \| Receive fixed swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	3,381	4,328
Fair Value, Gain	0	0
Fair Value, Loss	0	0
Not designated as hedges \| MSRs \| Interest rate contracts \| Options
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	1,203	3,155
Fair Value, Gain	22	48
Fair Value, Loss	0	(2)
Not designated as hedges \| MSRs \| Interest rate contracts \| When issued securities, forward rate agreements and forward commitments
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	1,841	1,590
Fair Value, Gain	9	10
Fair Value, Loss	(4)	0
Not designated as hedges \| MSRs \| Interest rate contracts \| Other
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	102	103
Fair Value, Gain	0	0
Fair Value, Loss	$ 0	$ 0

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

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