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Income Taxes (Narrative) (Details) - USD ($) $ in Billions | Dec. 31, 2023 | Dec. 31, 2022
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Income Tax Disclosure [Abstract] |  |
Allocations for bad debt deductions of former thrift subsidiaries included in retained earnings | $ 0.1 | $ 0.1

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- Definition Allocation for bad debt deductions of former thrift subsidiaries for which no income tax has been provided which is included in retained earnings + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration