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Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Financial Assets and Liabilities, Measured at Fair Value Recurring Basis [Table Text Block] | The following table presents a summary of fair value measurements by level and carrying values for items measured at fair value on a recurring basis in the Condensed Consolidated Balance Sheets:
(in millions) |  | Quoted Prices in Active Markets (Level 1) |  | Other Observable Inputs (Level 2) |  | Unobservable Inputs (Level 3) |  | Total Fair and Carrying Value
March 31, 2020 |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 21,450 |  |  | $ | 119 |  |  | $ | — |  |  | $ | 21,569 |
Debt securities - available-for-sale: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | 3,143 |  |  | 185 |  |  | — |  |  | 3,328 |
State and municipal obligations |  | — |  |  | 5,918 |  |  | — |  |  | 5,918 |
Corporate obligations |  | 59 |  |  | 17,385 |  |  | 250 |  |  | 17,694 |
U.S. agency mortgage-backed securities |  | — |  |  | 6,768 |  |  | — |  |  | 6,768 |
Non-U.S. agency mortgage-backed securities |  | — |  |  | 1,924 |  |  | — |  |  | 1,924 |
Total debt securities - available-for-sale |  | 3,202 |  |  | 32,180 |  |  | 250 |  |  | 35,632 |
Equity securities |  | 1,394 |  |  | 19 |  |  | — |  |  | 1,413 |
Assets under management |  | 937 |  |  | 1,890 |  |  | 39 |  |  | 2,866 |
Total assets at fair value |  | $ | 26,983 |  |  | $ | 34,208 |  |  | $ | 289 |  |  | $ | 61,480 |
Percentage of total assets at fair value |  | 44 | % |  | 56 | % |  | — | % |  | 100 | %
December 31, 2019 |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 10,837 |  |  | $ | 148 |  |  | $ | — |  |  | $ | 10,985 |
Debt securities - available-for-sale: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | 3,369 |  |  | 184 |  |  | — |  |  | 3,553 |
State and municipal obligations |  | — |  |  | 5,926 |  |  | — |  |  | 5,926 |
Corporate obligations |  | 70 |  |  | 17,923 |  |  | 249 |  |  | 18,242 |
U.S. agency mortgage-backed securities |  | — |  |  | 6,528 |  |  | — |  |  | 6,528 |
Non-U.S. agency mortgage-backed securities |  | — |  |  | 1,845 |  |  | — |  |  | 1,845 |
Total debt securities - available-for-sale |  | 3,439 |  |  | 32,406 |  |  | 249 |  |  | 36,094 |
Equity securities |  | 1,734 |  |  | 22 |  |  | — |  |  | 1,756 |
Assets under management |  | 1,123 |  |  | 1,918 |  |  | 35 |  |  | 3,076 |
Total assets at fair value |  | $ | 17,133 |  |  | $ | 34,494 |  |  | $ | 284 |  |  | $ | 51,911 |
Percentage of total assets at fair value |  | 33 | % |  | 66 | % |  | 1 | % |  | 100 | %
Fair Value Measurements, Nonrecurring [Table Text Block] | The following table presents a summary of fair value measurements by level and carrying values for certain financial instruments not measured at fair value on a recurring basis in the Condensed Consolidated Balance Sheets:
(in millions) |  | Quoted Prices in Active Markets (Level 1) |  | Other Observable Inputs (Level 2) |  | Unobservable Inputs (Level 3) |  | Total Fair Value |  | Total Carrying Value
March 31, 2020 |  |  |  |  |  |  |  |  |  |
Debt securities - held-to-maturity |  | $ | 556 |  |  | $ | 91 |  |  | $ | 88 |  |  | $ | 735 |  |  | $ | 725 |
Long-term debt and other financing obligations |  | $ | — |  |  | $ | 45,272 |  |  | $ | — |  |  | $ | 45,272 |  |  | $ | 40,394 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |
Debt securities - held-to-maturity |  | $ | 541 |  |  | $ | 181 |  |  | $ | 253 |  |  | $ | 975 |  |  | $ | 972 |
Long-term debt and other financing obligations |  | $ | — |  |  | $ | 45,078 |  |  | $ | — |  |  | $ | 45,078 |  |  | $ | 40,278 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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