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Summary of Significant Accounting Policies (Supplemental Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Interest Paid, Excluding Capitalized Interest, Operating Activities	$ 1,441	$ 303	$ 185
Income Taxes Paid, Net	376	336	367
Real Estate Owned, Transfer to Real Estate Owned	21	21	14
Transfer of Portfolio Loans and Leases to Held-for-sale	15	22	240
Transfer of Loans Held-for-sale to Portfolio Loans	18	24	277
Properties Transferred To Held For Sale	$ 79	$ 6	$ 38

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Properties Transferred To Held For Sale

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Value of loans held-for-sale transferred to loans held in the entity's portfolio in noncash transactions.

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