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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Due in one year or less, Amortized Cost $ 4,646  
Due after one year through five years, Amortized Cost 14,748  
Due after five years through ten years, Amortized Cost 11,332  
Due after ten years, Amortized Cost 5,180  
Total debt securities - available-for-sale, Amortized Cost 47,558 $ 45,926
Due in one year or less, Fair Value 4,613  
Due after one year through five years, Fair Value 13,935  
Due after five years through ten years, Fair Value 10,206  
Due after ten years, Fair Value 4,820  
Debt Securities, Available-for-sale 44,128 42,321
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One 466  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 225  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 31  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 18  
Debt Securities, Held-to-maturity 740 696
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 461  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 219  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 30  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 16  
Debt Securities, Held-to-maturity, Fair Value 726 679
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 8,504  
Total debt securities - available-for-sale, Amortized Cost 8,504 7,379
Mortgage-backed securities, Fair Value 7,710  
Debt Securities, Available-for-sale 7,710 6,586
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 3,148  
Total debt securities - available-for-sale, Amortized Cost 3,148 3,077
Mortgage-backed securities, Fair Value 2,844  
Debt Securities, Available-for-sale $ 2,844 $ 2,784