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Investment Securities (Details 1) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | $ 0 | $ 224
Estimated Fair Value, 12 months or more | 477 | 873
Available For Sale Securities Continuous Unrealized Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 Months | 0 | (2)
Gross Unrealized Losses, 12 months or more | (3) | (16)
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 0 | 0
Estimated Fair Value, 12 months or more | 0 | 82
Available For Sale Securities Continuous Unrealized Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 Months | 0 | 0
Gross Unrealized Losses, 12 months or more | 0 | (1)
US Treasury Securities [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 0 | 224
Estimated Fair Value, 12 months or more | 477 | 791
Available For Sale Securities Continuous Unrealized Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 Months | 0 | (2)
Gross Unrealized Losses, 12 months or more | $ (3) | $ (15)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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