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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, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Due in one year or less, Amortized Cost	$ 2,808
Due after one year through five years, Amortized Cost	13,088
Due after five years through ten years, Amortized Cost	11,550
Due after ten years, Amortized Cost	4,240
Total debt securities - available-for-sale, Amortized Cost	40,905	$ 38,079
Due in one year or less, Fair Value	2,822
Due after one year through five years, Fair Value	13,460
Due after five years through ten years, Fair Value	12,000
Due after ten years, Fair Value	4,425
Debt Securities, Available-for-sale	42,125	39,828
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	309
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	231
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	28
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	22
Debt Securities, Held-to-maturity	590	638
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value	310
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	233
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	29
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	23
Debt Securities, Held-to-maturity, Fair Value	595	647
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	6,596
Total debt securities - available-for-sale, Amortized Cost	6,596	6,849
Mortgage-backed securities, Fair Value	6,733
Debt Securities, Available-for-sale	6,733	7,091
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	2,623
Total debt securities - available-for-sale, Amortized Cost	2,623	2,116
Mortgage-backed securities, Fair Value	2,685
Debt Securities, Available-for-sale	$ 2,685	$ 2,207

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