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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 38,079	$ 35,328
Securities, Available for sale Debt Securities, Gross Unrealized Gains	1,771	795
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(22)	(29)
Debt Securities, Available-for-sale	39,828	36,094
Held-to-maturity securities, Amortized Cost	638	972
Securities, Held to maturity, Unrecognized Holding Gain	9	4
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(1)
Debt Securities, Held-to-maturity, Fair Value	647	975
Total investments, Amortized Cost	38,717	36,300
Total investments, Gross Unrealized Gains	1,780	799
Total investments, Gross Unrealized Losses	(22)	(30)
Investments, Fair Value Disclosure	40,475	37,069
Debt Securities - available-for-sale
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	39,828	36,094
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,335	3,502
Securities, Available for sale Debt Securities, Gross Unrealized Gains	133	55
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3)	(4)
Debt Securities, Available-for-sale	3,465	3,553
Held-to-maturity securities, Amortized Cost	420	402
Securities, Held to maturity, Unrecognized Holding Gain	6	2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	426	404
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,893	5,680
Securities, Available for sale Debt Securities, Gross Unrealized Gains	435	251
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(5)
Debt Securities, Available-for-sale	7,328	5,926
Held-to-maturity securities, Amortized Cost	31	32
Securities, Held to maturity, Unrecognized Holding Gain	2	2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	33	34
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	18,886	17,910
Securities, Available for sale Debt Securities, Gross Unrealized Gains	863	343
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(12)	(11)
Debt Securities, Available-for-sale	19,737	18,242
Held-to-maturity securities, Amortized Cost	187	538
Securities, Held to maturity, Unrecognized Holding Gain	1	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(1)
Debt Securities, Held-to-maturity, Fair Value	188	537
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,849	6,425
Securities, Available for sale Debt Securities, Gross Unrealized Gains	245	109
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3)	(6)
Debt Securities, Available-for-sale	7,091	6,528
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,116	1,811
Securities, Available for sale Debt Securities, Gross Unrealized Gains	95	37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(4)	(3)
Debt Securities, Available-for-sale	$ 2,207	$ 1,845

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