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Investments (Schedule of Investment Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Summary of Investment Holdings [Line Items]    
Investment securities $ 13,655 $ 12,208
US Treasury and Government    
Summary of Investment Holdings [Line Items]    
Investment securities [1],[2] 12,937 11,423
Residential Mortgage Backed Securities - Agency [Member]    
Summary of Investment Holdings [Line Items]    
Investment securities [3] 718 785
U.S. Treasury Securities [Member] | Asset Pledged as Collateral [Member]    
Summary of Investment Holdings [Line Items]    
Derivative collateral $ 320 $ 97
[1] $320 million and $97 million of U.S. Treasury securities pledged as swap collateral as of December 31, 2023 and 2022, respectively.
[2] Consists of securities issued by the Federal Home Loan Bank (“FHLB”).
[3] Consists of securities issued by Fannie Mae, Freddie Mac, or Ginnie Mae