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Derivative and Hedging Activities - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |
Interest income | $ 318 | $ 282 | $ 967 | $ 792 |
Gain (losses) on interest rate derivatives designated as cash flow hedge |  |  | 18 |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | 26 |  | 26 |  |
Interest Rate Swap | Cash Flow Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 2,250 |  | 2,250 |  | $ 2,250
Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 2,000 |  | 2,000 |  | $ 2,000
Interest income | 12 | $ 11 | 37 | $ 23 |
Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 2,000 |  | 2,000 |  |
LCH | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | $ 4,300 |  | $ 4,300 |  |

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