Variable Interest Entities (Activity Between Entities Footnotes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entities [Abstract]
Accretion Income for Amortization of Purchase Accounting Adjustment, Financial Assets	$ 19	$ 19	$ 19
Accretion Expense for Amortization of Purchase Accounting Adjustment, Financial Liabiities	$ 7	$ 7	$ 7