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FAIR VALUE (Tables) | 3 Months Ended
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Mar. 31, 2016
Fair Value Disclosures [Abstract] |
Financial Assets Measured at Fair Value on Recurring Basis | The following table summarizes our fair value measurements at March 31, 2016 and December 31, 2015, respectively, for financial assets measured at fair value on a recurring basis:
| Fair Value Measurements Using
| Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Other Observable Inputs (Level 2) |  | Unobservable Inputs (Level 3)
| (in millions)
March 31, 2016 |  |  |  |  |  |  |
Cash equivalents | $ | 2,669 |  |  | $ | 2,669 |  |  | $ | — |  |  | $ | — |
Debt securities: |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |
U.S. Treasury and agency obligations | 453 |  |  | — |  |  | 453 |  |  | — |
Mortgage-backed securities | 2,034 |  |  | — |  |  | 2,034 |  |  | — |
Tax-exempt municipal securities | 3,038 |  |  | — |  |  | 3,035 |  |  | 3 |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential | 11 |  |  | — |  |  | 11 |  |  | — |
Commercial | 859 |  |  | — |  |  | 859 |  |  | — |
Asset-backed securities | 253 |  |  | — |  |  | 252 |  |  | 1 |
Corporate debt securities | 3,030 |  |  | — |  |  | 3,025 |  |  | 5 |
Total debt securities | 9,678 |  |  | — |  |  | 9,669 |  |  | 9 |
Total invested assets | $ | 12,347 |  |  | $ | 2,669 |  |  | $ | 9,669 |  |  | $ | 9 |
December 31, 2015 |  |  |  |  |  |  |
Cash equivalents | $ | 2,229 |  |  | $ | 2,229 |  |  | $ | — |  |  | $ | — |
Debt securities: |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |
U.S. Treasury and agency obligations | 332 |  |  | — |  |  | 332 |  |  | — |
Mortgage-backed securities | 1,891 |  |  | — |  |  | 1,891 |  |  | — |
Tax-exempt municipal securities | 2,668 |  |  | — |  |  | 2,663 |  |  | 5 |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential | 13 |  |  | — |  |  | 13 |  |  | — |
Commercial | 985 |  |  | — |  |  | 985 |  |  | — |
Asset-backed securities | 263 |  |  | — |  |  | 263 |  |  | — |
Corporate debt securities | 2,958 |  |  | — |  |  | 2,952 |  |  | 6 |
Total debt securities | 9,110 |  |  | — |  |  | 9,099 |  |  | 11 |
Total invested assets | $ | 11,339 |  |  | $ | 2,229 |  |  | $ | 9,099 |  |  | $ | 11 |
Changes in Fair Value of Assets Measured Using Significant Unobservable Inputs | During the three months ended March 31, 2016 and 2015, the changes in the fair value of the assets measured using significant unobservable inputs (Level 3) were comprised of the following:
| For the three months ended March 31,
| 2016 |  | 2015
| Private Placements |  | Auction Rate Securities |  | Total |  | Private Placements |  | Auction Rate Securities |  | Total
| (in millions)
Beginning balance at January 1 | $ | 6 |  |  | $ | 5 |  |  | $ | 11 |  |  | $ | 24 |  |  | $ | 8 |  |  | $ | 32 |
Total gains or losses: |  |  |  |  |  |  |  |  |  |  |
Realized in earnings | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Unrealized in other comprehensive income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Purchases | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Sales | — |  |  | — |  |  | — |  |  | (18 | ) |  | (2 | ) |  | (20 | )
Settlements | — |  |  | (2 | ) |  | (2 | ) |  | — |  |  | — |  |  | — |
Balance at March 31 | $ | 6 |  |  | $ | 3 |  |  | $ | 9 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 12 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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