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Fair Value (Notes) | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value [Text Block] | Fair Value Certain assets and liabilities are measured at fair value in the Condensed Consolidated Financial Statements or have fair values disclosed in the Notes to the Condensed Consolidated Financial Statements. These assets and liabilities are classified into one of three levels of a hierarchy defined by GAAP. For a description of the methods and assumptions that are used to estimate the fair value and determine the fair value hierarchy classification of each class of financial instrument, see Note 4 of Notes to the Consolidated Financial Statements in Part II, Item 8, “Financial Statements and Supplementary Data” in the 2020 10-K. 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, 2021 |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 19,880 |  |  | $ | 75 |  |  | $ | — |  |  | $ | 19,955 |
Debt securities - available-for-sale: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | 3,208 |  |  | 224 |  |  | — |  |  | 3,432 |
State and municipal obligations |  | — |  |  | 7,264 |  |  | — |  |  | 7,264 |
Corporate obligations |  | 29 |  |  | 20,497 |  |  | 280 |  |  | 20,806 |
U.S. agency mortgage-backed securities |  | — |  |  | 6,921 |  |  | — |  |  | 6,921 |
Non-U.S. agency mortgage-backed securities |  | — |  |  | 2,429 |  |  | — |  |  | 2,429 |
Total debt securities - available-for-sale |  | 3,237 |  |  | 37,335 |  |  | 280 |  |  | 40,852 |
Equity securities |  | 1,975 |  |  | 27 |  |  | — |  |  | 2,002 |
Assets under management |  | 1,753 |  |  | 2,286 |  |  | 55 |  |  | 4,094 |
Total assets at fair value |  | $ | 26,845 |  |  | $ | 39,723 |  |  | $ | 335 |  |  | $ | 66,903 |
Percentage of total assets at fair value |  | 40 | % |  | 59 | % |  | 1 | % |  | 100 | %
December 31, 2020 |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 16,841 |  |  | $ | 80 |  |  | $ | — |  |  | $ | 16,921 |
Debt securities - available-for-sale: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | 3,241 |  |  | 224 |  |  | — |  |  | 3,465 |
State and municipal obligations |  | — |  |  | 7,328 |  |  | — |  |  | 7,328 |
Corporate obligations |  | 25 |  |  | 19,424 |  |  | 288 |  |  | 19,737 |
U.S. agency mortgage-backed securities |  | — |  |  | 7,091 |  |  | — |  |  | 7,091 |
Non-U.S. agency mortgage-backed securities |  | — |  |  | 2,207 |  |  | — |  |  | 2,207 |
Total debt securities - available-for-sale |  | 3,266 |  |  | 36,274 |  |  | 288 |  |  | 39,828 |
Equity securities |  | 1,795 |  |  | 33 |  |  | — |  |  | 1,828 |
Assets under management |  | 1,774 |  |  | 2,250 |  |  | 52 |  |  | 4,076 |
Total assets at fair value |  | $ | 23,676 |  |  | $ | 38,637 |  |  | $ | 340 |  |  | $ | 62,653 |
Percentage of total assets at fair value |  | 38 | % |  | 61 | % |  | 1 | % |  | 100 | %
There were no transfers in or out of Level 3 financial assets or liabilities during the three months ended March 31, 2021 or 2020. 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, 2021 |  |  |  |  |  |  |  |  |  |
Debt securities - held-to-maturity |  | $ | 463 |  |  | $ | 110 |  |  | $ | 73 |  |  | $ | 646 |  |  | $ | 639 |
Long-term debt and other financing obligations |  | $ | — |  |  | $ | 46,315 |  |  | $ | — |  |  | $ | 46,315 |  |  | $ | 40,903 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |
Debt securities - held-to-maturity |  | $ | 466 |  |  | $ | 108 |  |  | $ | 73 |  |  | $ | 647 |  |  | $ | 638 |
Long-term debt and other financing obligations |  | $ | — |  |  | $ | 51,254 |  |  | $ | — |  |  | $ | 51,254 |  |  | $ | 42,171 |
Nonfinancial assets and liabilities or financial assets and liabilities that are measured at fair value on a nonrecurring basis are subject to fair value adjustments only in certain circumstances, such as when the Company records an impairment. There were no significant fair value adjustments for these assets and liabilities recorded during either the three months ended March 31, 2021 or 2020.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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