Loan Receivables (Schedule of Changes in Accretable Yield for the Acquired Loans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield, balance at beginning of period	$ 548	$ 669	$ 796
Accretion into interest income	(119)	(139)	(159)
Other changes in expected cash flows	23	18	32
Accretable yield, balance at end of period	$ 452	$ 548	$ 669