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Investments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Securities [Line Items]
Net income from unconsolidated investees	$ 31	$ 52	$ 70
OCC
Investments, Debt and Securities [Line Items]
Equity method investment, ownership percentage	40.00%	40.00%
Foreign government debt securities
Investments, Debt and Securities [Line Items]
Trading securities	$ 161	$ 162

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Investments, Debt and Securities [Line Items]

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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