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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 34,478	$ 35,328
Securities, Available for sale Debt Securities, Gross Unrealized Gains	1,593	795
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(85)	(29)
Debt Securities, Available-for-sale	35,986	36,094
Held-to-maturity securities, Amortized Cost	737	972
Securities, Held to maturity, Unrecognized Holding Gain	10	4
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(1)
Debt Securities, Held-to-maturity, Fair Value	747	975
Total debt securities, Amortized Cost	35,215	36,300
Total debt securities, Gross Unrealized Gains	1,603	799
Total debt securities, Gross Unrealized Losses	(85)	(30)
Debt securities, Fair Value Disclosure	36,733	37,069
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	35,986	36,094
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,402	3,502
Securities, Available for sale Debt Securities, Gross Unrealized Gains	178	55
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(4)
Debt Securities, Available-for-sale	3,580	3,553
Held-to-maturity securities, Amortized Cost	421	402
Securities, Held to maturity, Unrecognized Holding Gain	8	2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	429	404
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,872	5,680
Securities, Available for sale Debt Securities, Gross Unrealized Gains	330	251
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3)	(5)
Debt Securities, Available-for-sale	6,199	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	17,324	17,910
Securities, Available for sale Debt Securities, Gross Unrealized Gains	728	343
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(68)	(11)
Debt Securities, Available-for-sale	17,984	18,242
Held-to-maturity securities, Amortized Cost	285	538
Securities, Held to maturity, Unrecognized Holding Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(1)
Debt Securities, Held-to-maturity, Fair Value	285	537
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,005	6,425
Securities, Available for sale Debt Securities, Gross Unrealized Gains	274	109
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(6)
Debt Securities, Available-for-sale	6,279	6,528
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,875	1,811
Securities, Available for sale Debt Securities, Gross Unrealized Gains	83	37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(14)	(3)
Debt Securities, Available-for-sale	$ 1,944	$ 1,845

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