Long-Term Debt (Schedule of Subordinated Notes) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Subordinated Borrowing [Line Items]
Subordinated notes	$ 590	$ 619
Subordinated notes, Par amount	588
Subordinated Notes, Interest Rate 6.95%
Subordinated Borrowing [Line Items]
Subordinated notes	88
Subordinated notes, Par amount	$ 88
Subordinated Notes, Interest Rate 6.95% | Subordinated Debt
Subordinated Borrowing [Line Items]
Coupon rate	6.95%
Subordinated Notes, Interest Rate 3.25%
Subordinated Borrowing [Line Items]
Subordinated notes	$ 502
Subordinated notes, Par amount	$ 500
Subordinated Notes, Interest Rate 3.25% | Subordinated Debt
Subordinated Borrowing [Line Items]
Coupon rate	3.25%