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Borrowings Borrowings - Stated Maturity and Maturity to Call Date (Details) - USD ($)
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
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