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Investments Investments (Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Available for sale, at amortized cost	$ 78,637	$ 77,835
Available-for-sale,Gross Unrealized Gain	703	1,528
Available-for-sale, Gross Unrealized Depreciation	(1,487)	(424)
Available for sale, Fair Value	77,853	78,939
Available for sale, OTTI recognized in AOCI	(7)	(6)
U.S. Treasury and agency
Debt Securities, Available-for-sale [Line Items]
Available for sale, at amortized cost	4,137	3,701
Available-for-sale,Gross Unrealized Gain	13	32
Available-for-sale, Gross Unrealized Depreciation	(101)	(35)
Available for sale, Fair Value	4,049	3,698
Available for sale, OTTI recognized in AOCI	0	0
Foreign
Debt Securities, Available-for-sale [Line Items]
Available for sale, at amortized cost	21,280	20,514
Available-for-sale,Gross Unrealized Gain	374	622
Available-for-sale, Gross Unrealized Depreciation	(299)	(106)
Available for sale, Fair Value	21,355	21,030
Available for sale, OTTI recognized in AOCI	0	(1)
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Available for sale, at amortized cost	24,905	23,453
Available-for-sale,Gross Unrealized Gain	248	638
Available-for-sale, Gross Unrealized Depreciation	(358)	(95)
Available for sale, Fair Value	24,795	23,996
Available for sale, OTTI recognized in AOCI	(6)	(4)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Available for sale, at amortized cost	16,395	15,279
Available-for-sale,Gross Unrealized Gain	26	111
Available-for-sale, Gross Unrealized Depreciation	(523)	(100)
Available for sale, Fair Value	15,898	15,290
Available for sale, OTTI recognized in AOCI	(1)	(1)
States, municipalities, and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Available for sale, at amortized cost	11,920	14,888
Available-for-sale,Gross Unrealized Gain	42	125
Available-for-sale, Gross Unrealized Depreciation	(206)	(88)
Available for sale, Fair Value	11,756	14,925
Available for sale, OTTI recognized in AOCI	$ 0	$ 0

X

- Definition

Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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