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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Due in one year or less, Amortized Cost	$ 3,037
Due after one year through five years, Amortized Cost	12,571
Due after five years through ten years, Amortized Cost	10,945
Due after ten years, Amortized Cost	4,155
Total debt securities - available-for-sale, Amortized Cost	39,874	$ 38,079
Due in one year or less, Fair Value	3,053
Due after one year through five years, Fair Value	12,922
Due after five years through ten years, Fair Value	11,263
Due after ten years, Fair Value	4,264
Debt Securities, Available-for-sale	40,852	39,828
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	354
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	238
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	25
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	22
Debt Securities, Held-to-maturity	639	638
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value	355
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	242
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	26
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	23
Debt Securities, Held-to-maturity, Fair Value	646	647
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	6,784
Total debt securities - available-for-sale, Amortized Cost	6,784	6,849
Mortgage-backed securities, Fair Value	6,921
Debt Securities, Available-for-sale	6,921	7,091
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Mortgage-backed securities, Amortized Cost	2,382
Total debt securities - available-for-sale, Amortized Cost	2,382	2,116
Mortgage-backed securities, Fair Value	2,429
Debt Securities, Available-for-sale	$ 2,429	$ 2,207

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