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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, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Due in one year or less, Amortized Cost	$ 3,439
Due after one year through five years, Amortized Cost	13,237
Due after five years through ten years, Amortized Cost	12,332
Due after ten years, Amortized Cost	4,605
Total debt securities - available-for-sale, Amortized Cost	42,814	$ 39,669
Due in one year or less, Fair Value	3,422
Due after one year through five years, Fair Value	12,672
Due after five years through ten years, Fair Value	11,213
Due after ten years, Fair Value	4,232
Debt Securities, Available-for-sale	40,004	40,217
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	385
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	295
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	14
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	20
Debt Securities, Held-to-maturity	714	641
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value	381
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	288
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	13
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	19
Debt Securities, Held-to-maturity, Fair Value	701	643
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	6,275
Total debt securities - available-for-sale, Amortized Cost	6,275	5,868
Mortgage-backed securities, Fair Value	5,740
Debt Securities, Available-for-sale	5,740	5,901
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	2,926
Total debt securities - available-for-sale, Amortized Cost	2,926	2,819
Mortgage-backed securities, Fair Value	2,725
Debt Securities, Available-for-sale	$ 2,725	$ 2,838

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