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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 | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 82,580 | $ 79,323
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,074 | 690
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (166) | (1,543)
Available for sale, Fair Value | 85,488 | 78,470
Available for sale, OTTI recognized in AOCI | (30) | (7)
US Treasury and Government [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,188 | 4,158
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 96 | 30
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1) | (43)
Available for sale, Fair Value | 3,283 | 4,145
Available for sale, OTTI recognized in AOCI | 0 | 0
Foreign |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 22,670 | 21,370
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,099 | 395
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (62) | (349)
Available for sale, Fair Value | 23,707 | 21,416
Available for sale, OTTI recognized in AOCI | (25) | 0
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 30,689 | 27,183
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,180 | 150
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (78) | (750)
Available for sale, Fair Value | 31,791 | 26,583
Available for sale, OTTI recognized in AOCI | (5) | (6)
Collateralized Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 18,712 | 15,758
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 494 | 66
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (14) | (284)
Available for sale, Fair Value | 19,192 | 15,540
Available for sale, OTTI recognized in AOCI | 0 | (1)
States, municipalities, and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,321 | 10,854
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 205 | 49
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (11) | (117)
Available for sale, Fair Value | 7,515 | 10,786
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=118954083&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=118939692&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=118930883&loc=SL7669686-108580 + Details
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