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Derivative Financial Instruments and Hedging Activities (Schedule of Derivative Instruments Notional and Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 153,915 | $ 138,062
Derivative Asset, Fair Value, Gross Asset | 1,889 | 1,111
Derivative Liabilities, Fair Value, Gross Liability | 2,426 | 1,012
Derivative Asset netting adjustments | 1,680 | 699
Derivative Liability, netting adjustments | 1,542 | 932
Derivative Assets | 209 | 412
Derivative Liabilities | 884 | 80
Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 41,023 | 28,550
Derivative Asset, Fair Value, Gross Asset | 112 | 171
Derivative Liabilities, Fair Value, Gross Liability | 663 | 61
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 112,892 | 109,512
Derivative Asset, Fair Value, Gross Asset | 1,777 | 940
Derivative Liabilities, Fair Value, Gross Liability | 1,763 | 951
Interest Rate Swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Instrument, Accrued Interest | 0 | 12
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 83,544 | 81,327
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 1,378 | 748
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Fair Value, Gross Liability | 1,428 | 794
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 17,040 | 15,990
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 87 | 48
Interest Rate Options [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Fair Value, Gross Liability | 64 | 19
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,747 | 2,739
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 11 | 11
Interest Rate Futures And Forward Commitments [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Fair Value, Gross Liability | 4 | 3
Other Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 10,561 | 9,456
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 301 | 133
Other Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Fair Value, Gross Liability | 267 | 135
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 7,923 | 7,900
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 36 | 0
Fair Value Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Fair Value, Gross Liability | 120 | 32
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 33,100 | 20,650
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 76 | 171
Cash Flow Hedging [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities, Fair Value, Gross Liability | $ 543 | $ 29

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