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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 35,233	$ 35,328
Securities, Available for sale Debt Securities, Gross Unrealized Gains	867	795
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(468)	(29)
Debt Securities, Available-for-sale	35,632	36,094
Held-to-maturity securities, Amortized Cost	725	972
Securities, Held to maturity, Unrecognized Holding Gain	11	4
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1)	(1)
Debt Securities, Held-to-maturity, Fair Value	735	975
Total debt securities, Amortized Cost	35,958	36,300
Total debt securities, Gross Unrealized Gains	878	799
Total debt securities, Gross Unrealized Losses	(469)	(30)
Debt securities, Fair Value Disclosure	36,367	37,069
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	35,632	36,094
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,146	3,502
Securities, Available for sale Debt Securities, Gross Unrealized Gains	183	55
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1)	(4)
Debt Securities, Available-for-sale	3,328	3,553
Held-to-maturity securities, Amortized Cost	410	402
Securities, Held to maturity, Unrecognized Holding Gain	9	2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	419	404
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,724	5,680
Securities, Available for sale Debt Securities, Gross Unrealized Gains	214	251
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(20)	(5)
Debt Securities, Available-for-sale	5,918	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	17,923	17,910
Securities, Available for sale Debt Securities, Gross Unrealized Gains	182	343
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(411)	(11)
Debt Securities, Available-for-sale	17,694	18,242
Held-to-maturity securities, Amortized Cost	284	538
Securities, Held to maturity, Unrecognized Holding Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1)	(1)
Debt Securities, Held-to-maturity, Fair Value	283	537
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,508	6,425
Securities, Available for sale Debt Securities, Gross Unrealized Gains	260	109
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(6)
Debt Securities, Available-for-sale	6,768	6,528
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,932	1,811
Securities, Available for sale Debt Securities, Gross Unrealized Gains	28	37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(36)	(3)
Debt Securities, Available-for-sale	$ 1,924	$ 1,845

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