Financing Receivables Financing Receivables (Troubled Debt Restructurings) (Details) loan in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 loan
Receivables [Abstract]
Loans accounted for as troubled debt restructuring | loan	0	0	0	0
Commitments to lend additional funds to borrowers whose loans have been restructured | $	$ 0		$ 0