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Summary of Significant Accounting Policies (Supplemental Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounting Policies [Abstract] |  |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities | $ 2,219 | $ 1,441 | $ 303
Income Taxes Paid, Net | 64 | 376 | 336
Transfer to Investments | 3,763 | 0 | 0
Real Estate Owned, Transfer to Real Estate Owned | 20 | 21 | 21
Transfer of Portfolio Loans and Leases to Held-for-sale | 18 | 15 | 22
Transfer of Loans Held-for-sale to Portfolio Loans | 10 | 18 | 24
Properties Transferred To Held For Sale | $ 8 | $ 79 | $ 6

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