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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
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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

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284427-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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