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Borrowings Borrowings - Stated Maturity and Maturity to Call Date (Details) - USD ($) | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |  |
Stated maturity, 2019 | $ 3,577,276,000 |  |
Stated maturity, 2020 | 2,207,379,000 |  |
Stated maturity, 2021 | 1,841,762,000 |  |
Stated maturity, 2022 | 1,125,529,000 |  |
Stated maturity, 2023 | 1,745,512,000 |  |
Stated maturity, 2024 and after | 1,956,445,000 |  |
Maturity to Call Date, 2019 | 3,577,276,000 |  |
Maturity to Call Date, 2020 | 2,207,379,000 |  |
Maturity to Call Date, 2021 | 1,841,762,000 |  |
Maturity to Call Date, 2022 | 1,125,529,000 |  |
Maturity to Call Date, 2023 | 1,745,512,000 |  |
Maturity to Call Date, 2024 and after | 1,956,445,000 |  |
Total principal amount | 12,453,903,000 | $ 1,900,500,000 | $ 1,448,000,000
Total principal amount, maturity to call date | 12,453,903,000 |  |
Hedge Accounting Adjustment | (10,330,000) |  |
Total principal amount, after adjustments | 12,443,573,000 |  |
Brokered Deposits |  |  |
Debt Instrument [Line Items] |  |  |
Stated maturity, 2019 | 2,990,740,000 |  |
Stated maturity, 2020 | 1,706,761,000 |  |
Stated maturity, 2021 | 1,381,842,000 |  |
Stated maturity, 2022 | 465,809,000 |  |
Stated maturity, 2023 | 1,272,479,000 |  |
Stated maturity, 2024 and after | 161,549,000 |  |
Maturity to Call Date, 2019 | 2,990,740,000 |  |
Maturity to Call Date, 2020 | 1,706,761,000 |  |
Maturity to Call Date, 2021 | 1,381,842,000 |  |
Maturity to Call Date, 2022 | 465,809,000 |  |
Maturity to Call Date, 2023 | 1,272,479,000 |  |
Maturity to Call Date, 2024 and after | 161,549,000 |  |
Total principal amount | 7,979,180,000 |  |
Total principal amount, maturity to call date | 7,979,180,000 |  |
Hedge Accounting Adjustment | (10,330,000) |  |
Total principal amount, after adjustments | 7,968,850,000 |  |
Unsecured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Stated maturity, 2019 | 0 |  |
Stated maturity, 2020 | 0 |  |
Stated maturity, 2021 | 0 |  |
Stated maturity, 2022 | 200,000,000 |  |
Stated maturity, 2023 | 0 |  |
Stated maturity, 2024 and after | 0 |  |
Maturity to Call Date, 2019 | 0 |  |
Maturity to Call Date, 2020 | 0 |  |
Maturity to Call Date, 2021 | 0 |  |
Maturity to Call Date, 2022 | 200,000,000 |  |
Maturity to Call Date, 2023 | 0 |  |
Maturity to Call Date, 2024 and after | 0 |  |
Total principal amount | 200,000,000 |  |
Total principal amount, maturity to call date | 200,000,000 |  |
Hedge Accounting Adjustment | 0 |  |
Total principal amount, after adjustments | 200,000,000 |  |
Secured Borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Stated maturity, 2019 | 586,536,000 |  |
Stated maturity, 2020 | 500,618,000 |  |
Stated maturity, 2021 | 459,920,000 |  |
Stated maturity, 2022 | 459,720,000 |  |
Stated maturity, 2023 | 473,033,000 |  |
Stated maturity, 2024 and after | 1,794,896,000 |  |
Maturity to Call Date, 2019 | 586,536,000 |  |
Maturity to Call Date, 2020 | 500,618,000 |  |
Maturity to Call Date, 2021 | 459,920,000 |  |
Maturity to Call Date, 2022 | 459,720,000 |  |
Maturity to Call Date, 2023 | 473,033,000 |  |
Maturity to Call Date, 2024 and after | 1,794,896,000 |  |
Total principal amount | 4,274,723,000 |  |
Total principal amount, maturity to call date | 4,274,723,000 |  |
Hedge Accounting Adjustment | 0 |  |
Total principal amount, after adjustments | $ 4,274,723,000 |  |

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