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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Investments, Debt and Securities [Line Items]      
Net income from unconsolidated investees $ 7 $ 57  
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 $ 155   $ 162