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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, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Due in one year or less, Amortized Cost	$ 2,871
Due after one year through five years, Amortized Cost	13,492
Due after five years through ten years, Amortized Cost	12,062
Due after ten years, Amortized Cost	4,280
Total debt securities - available-for-sale, Amortized Cost	41,749	$ 38,079
Due in one year or less, Fair Value	2,886
Due after one year through five years, Fair Value	13,826
Due after five years through ten years, Fair Value	12,406
Due after ten years, Fair Value	4,423
Debt Securities, Available-for-sale	42,757	39,828
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	234
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	333
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	26
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	23
Debt Securities, Held-to-maturity	616	638
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value	235
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	334
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	27
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	24
Debt Securities, Held-to-maturity, Fair Value	620	647
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	6,281
Total debt securities - available-for-sale, Amortized Cost	6,281	6,849
Mortgage-backed securities, Fair Value	6,403
Debt Securities, Available-for-sale	6,403	7,091
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	2,763
Total debt securities - available-for-sale, Amortized Cost	2,763	2,116
Mortgage-backed securities, Fair Value	2,813
Debt Securities, Available-for-sale	$ 2,813	$ 2,207

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