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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Amendment to the Secured Borrowing Facility On February 20, 2019, we amended and extended the maturity of the Secured Borrowing Facility, discussed in Note 9, “Borrowings.” The amended Secured Borrowing Facility is a $750 million Secured Borrowing Facility, under which the full $750 million is available for us to draw. Under the amended Secured Borrowing Facility, we incur financing costs of between 0.35 percent and 0.45 percent on unused borrowing capacity and a variable-yield rate plus 0.85 percent on outstandings. The amended Secured Borrowing Facility extends the revolving period, during which we may borrow, repay and reborrow funds, until February 19, 2020. The scheduled amortization period, during which amounts outstanding under the Secured Borrowing Facility must be repaid, ends on February 19, 2021 (or earlier, if certain material adverse events occur).