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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Due in one year or less, Amortized Cost $ 4,722  
Due after one year through five years, Amortized Cost 14,356  
Due after five years through ten years, Amortized Cost 12,240  
Due after ten years, Amortized Cost 5,646  
Total debt securities - available-for-sale, Amortized Cost 48,333 $ 45,926
Due in one year or less, Fair Value 4,691  
Due after one year through five years, Fair Value 13,708  
Due after five years through ten years, Fair Value 11,217  
Due after ten years, Fair Value 5,351  
Debt Securities, Available-for-sale 45,381 42,321
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One 377  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 261  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 24  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 20  
Debt Securities, Held-to-maturity 682 696
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 376  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 254  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 22  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 17  
Debt Securities, Held-to-maturity, Fair Value 669 679
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 8,213  
Total debt securities - available-for-sale, Amortized Cost 8,213 7,379
Mortgage-backed securities, Fair Value 7,540  
Debt Securities, Available-for-sale 7,540 6,586
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 3,156  
Total debt securities - available-for-sale, Amortized Cost 3,156 3,077
Mortgage-backed securities, Fair Value 2,874  
Debt Securities, Available-for-sale $ 2,874 $ 2,784