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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, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	$ 82,254	$ 79,536
Available-for-sale,Gross Unrealized Gain	1,811	1,455
Available-for-sale, Gross Unrealized Depreciation	(379)	(876)
Available for sale, Fair Value	83,686	80,115
Available for sale, OTTI recognized in AOCI	(7)	(14)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	3,571	2,883
Available-for-sale,Gross Unrealized Gain	38	32
Available-for-sale, Gross Unrealized Depreciation	(27)	(45)
Available for sale, Fair Value	3,582	2,870
Available for sale, OTTI recognized in AOCI	0	0
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	22,516	20,929
Available-for-sale,Gross Unrealized Gain	690	636
Available-for-sale, Gross Unrealized Depreciation	(107)	(125)
Available for sale, Fair Value	23,099	21,440
Available for sale, OTTI recognized in AOCI	(2)	(5)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	24,555	23,736
Available-for-sale,Gross Unrealized Gain	754	580
Available-for-sale, Gross Unrealized Depreciation	(83)	(167)
Available for sale, Fair Value	25,226	24,149
Available for sale, OTTI recognized in AOCI	(4)	(8)
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	15,369	14,066
Available-for-sale,Gross Unrealized Gain	157	135
Available-for-sale, Gross Unrealized Depreciation	(115)	(194)
Available for sale, Fair Value	15,411	14,007
Available for sale, OTTI recognized in AOCI	(1)	(1)
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, at amortized cost	16,243	17,922
Available-for-sale,Gross Unrealized Gain	172	72
Available-for-sale, Gross Unrealized Depreciation	(47)	(345)
Available for sale, Fair Value	16,368	17,649
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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 9A
-URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284427-111562

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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-Publisher FASB
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-Topic 320
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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