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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Due in one year or less, Amortized Cost	$ 3,840
Due after one year through five years, Amortized Cost	12,565
Due after five years through ten years, Amortized Cost	12,172
Due after ten years, Amortized Cost	5,088
Total debt securities - available-for-sale, Amortized Cost	43,697	$ 39,669
Due in one year or less, Fair Value	3,809
Due after one year through five years, Fair Value	11,755
Due after five years through ten years, Fair Value	10,608
Due after ten years, Fair Value	4,519
Debt Securities, Available-for-sale	39,554	40,217
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	330
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	257
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	34
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	20
Debt Securities, Held-to-maturity	641	641
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value	326
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	246
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	32
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	17
Debt Securities, Held-to-maturity, Fair Value	621	643
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	6,868
Total debt securities - available-for-sale, Amortized Cost	6,868	5,868
Mortgage-backed securities, Fair Value	5,994
Debt Securities, Available-for-sale	5,994	5,901
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	3,164
Total debt securities - available-for-sale, Amortized Cost	3,164	2,819
Mortgage-backed securities, Fair Value	2,869
Debt Securities, Available-for-sale	$ 2,869	$ 2,838

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