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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Due in one year or less, Amortized Cost	$ 2,951
Due after one year through five years, Amortized Cost	11,638
Due after five years through ten years, Amortized Cost	10,212
Due after ten years, Amortized Cost	4,313
Total debt securities - available-for-sale, Amortized Cost	38,079	$ 35,328
Due in one year or less, Fair Value	2,966
Due after one year through five years, Fair Value	12,088
Due after five years through ten years, Fair Value	10,931
Due after ten years, Fair Value	4,545
Debt Securities, Available-for-sale	39,828	36,094
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	348
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	349
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	241
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	245
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	27
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	29
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	22
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	24
Debt Securities, Held-to-maturity	638	972
Debt Securities, Held-to-maturity, Fair Value	647	975
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	6,849
Total debt securities - available-for-sale, Amortized Cost	6,849	6,425
Debt Securities, Available-for-sale	7,091	6,528
Mortgage-backed securities, Fair Value	7,091
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	2,116
Total debt securities - available-for-sale, Amortized Cost	2,116	1,811
Debt Securities, Available-for-sale	2,207	$ 1,845
Mortgage-backed securities, Fair Value	$ 2,207

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