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Derivatives and Hedging Activities (Details Textuals) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |
Margin on interest rate swaps | $ 15,000,000 |  | $ 15,000,000 |  | $ 34,000,000
Carrying values of hedged liabilities | 13,200,000,000 |  | 13,200,000,000 |  | 16,400,000,000
Cumulative amount of fair value hedging adjustment | 365,000,000 |  | 365,000,000 |  | 622,000,000
Net decrease in interest expense on long term debt and other | 60,000,000 | $ 81,000,000 | 196,000,000 | $ 183,000,000 |
Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 16,800,000,000 |  | 16,800,000,000 |  | 14,400,000,000
Other Expense |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
(Loss) gain in changes in fair value of derivatives not designated as hedges | (10,000,000) | 4,000,000 | (24,000,000) | 22,000,000 |
Fair Value Hedging | Fixed-Rate Debt Obligations |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed-rate debt obligations designated in fair value hedging relationships | 12,900,000,000 |  | 12,900,000,000 |  | 15,800,000,000
Net Investment Hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 11,400,000,000 |  | 11,400,000,000 |  | $ 10,500,000,000
Gain (loss) on net investment hedges, net of taxes | 155,000,000 | (170,000,000) | 53,000,000 | 223,000,000 |
Reclassifications out of AOCI | $ 0 | $ 0 | $ 0 | $ 0 |

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