Borrowed Funds (Remaining Maturity) (Details) $ in Billions	Dec. 31, 2021 USD ($)
Debt Disclosure [Abstract]
Due in 2022	$ 7.2
Due in 2023	3.8
Due in 2024	3.7
Due in 2025	3.2
Due in 2026	1.8
Due in 2027 and thereafter	$ 11.1

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