Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards	$ 1,786	$ 1,784
Deferred Tax Assets, Adjustments to loan value	923	448
Deferred Tax Assets, State and local taxes	191	153
Deferred Tax Assets, Other	366	312
Deferred Tax Assets, Gross	3,266	2,697
Deferred Tax Assets, Valuation Allowance	(835)	(837)
Deferred Tax Assets, Net of Valuation Allowance	2,431	1,860
Deferred Tax Liabilities, Lease transactions	1,809	1,325
Deferred Tax Liabilities, Deferred acquisition costs	391	366
Deferred Tax Liabilities, Other	229	178
Deferred Tax Liabilities, Gross	2,429	1,869
Net deferred tax assets (liabilities), net of deferred tax (liabilities) assets	2	(9)
Net deferred tax assets	94	58
Deferred Tax Liabilities, Net	$ 92	$ 67