Financial Derivatives (Gains (Losses) Recognized on Fair Value and Cash Flow Hedges in Consolidated Income Statement) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Loans, Interest Income	$ 9,580	$ 8,238	$ 7,414
Investment securities, Interest Income	2,261	1,998	1,826
Borrowed funds, Interest Expense	1,632	1,083	831
Other	1,205	1,077	1,039
Fair Value Hedging \| Designated as Hedging Instrument \| Interest Rate Contract \| Investment Securities \| Investment Securities Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Related Hedged Items Recognized in Income	(53)	(50)	(141)
Gain (Loss) on Derivatives Recognized in Income	60	48	142
Interest Settlements on Derivatives	3	(41)	(84)
Fair Value Hedging \| Designated as Hedging Instrument \| Interest Rate Contract \| Borrowings \| Borrowed Funds Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Related Hedged Items Recognized in Income	151	268	299
Gain (Loss) on Derivatives Recognized in Income	(262)	(284)	(332)
Interest Settlements on Derivatives	80	234	401
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest Rate Contract \| Investment Securities \| Investment Securities Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	11	21	34
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest Rate Contract \| Other Income \| Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	8	17
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest Rate Contract \| Loans \| Investment Securities Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 41	$ 159	$ 219

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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