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Derivative and Hedging Activities - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |
Interest income | $ 331 | $ 266 | $ 649 | $ 510 |
Gain (losses) on interest rate derivatives designated as cash flow hedge |  |  | 11 |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | 25 |  | 25 |  |
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 | $ 8 | 24 | $ 12 |
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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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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