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INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investment Securities Classified as Current and Long-Term | Investment securities classified as current and long-term were as follows at June 30, 2017 and December 31, 2016, respectively:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (in millions)
June 30, 2017 |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |
U.S. Treasury and agency obligations | $ | 724 |  |  | $ | 1 |  |  | $ | (9 | ) |  | $ | 716 |
Mortgage-backed securities | 1,567 |  |  | 4 |  |  | (25 | ) |  | 1,546 |
Tax-exempt municipal securities | 3,304 |  |  | 23 |  |  | (21 | ) |  | 3,306 |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential | 8 |  |  | — |  |  | — |  |  | 8 |
Commercial | 394 |  |  | 2 |  |  | (2 | ) |  | 394 |
Asset-backed securities | 135 |  |  | — |  |  | — |  |  | 135 |
Corporate debt securities | 4,514 |  |  | 206 |  |  | (40 | ) |  | 4,680 |
Total debt securities | $ | 10,646 |  |  | $ | 236 |  |  | $ | (97 | ) |  | $ | 10,785 |
December 31, 2016 |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |
U.S. Treasury and agency obligations | $ | 800 |  |  | $ | 1 |  |  | $ | (15 | ) |  | $ | 786 |
Mortgage-backed securities | 1,662 |  |  | 6 |  |  | (31 | ) |  | 1,637 |
Tax-exempt municipal securities | 3,358 |  |  | 15 |  |  | (68 | ) |  | 3,305 |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential | 9 |  |  | — |  |  | — |  |  | 9 |
Commercial | 307 |  |  | 1 |  |  | (4 | ) |  | 304 |
Asset-backed securities | 160 |  |  | — |  |  | — |  |  | 160 |
Corporate debt securities | 3,530 |  |  | 145 |  |  | (78 | ) |  | 3,597 |
Total debt securities | $ | 9,826 |  |  | $ | 168 |  |  | $ | (196 | ) |  | $ | 9,798 |
Schedule of Gross Unrealized Losses and Fair Value of Securities | Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at June 30, 2017 and December 31, 2016, respectively:
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (in millions)
June 30, 2017 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency obligations | $ | 645 |  |  | $ | (9 | ) |  | $ | 3 |  |  | $ | — |  |  | $ | 648 |  |  | $ | (9 | )
Mortgage-backed securities | 1,310 |  |  | (25 | ) |  | 3 |  |  | — |  |  | 1,313 |  |  | (25 | )
Tax-exempt municipal securities | 1,898 |  |  | (20 | ) |  | 39 |  |  | (1 | ) |  | 1,937 |  |  | (21 | )
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Residential | — |  |  | — |  |  | 4 |  |  | — |  |  | 4 |  |  | — |
Commercial | 99 |  |  | (2 | ) |  | 1 |  |  | — |  |  | 100 |  |  | (2 | )
Asset-backed securities | 92 |  |  | — |  |  | — |  |  | — |  |  | 92 |  |  | — |
Corporate debt securities | 1,200 |  |  | (37 | ) |  | 64 |  |  | (3 | ) |  | 1,264 |  |  | (40 | )
Total debt securities | $ | 5,244 |  |  | $ | (93 | ) |  | $ | 114 |  |  | $ | (4 | ) |  | $ | 5,358 |  |  | $ | (97 | )
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency obligations | $ | 697 |  |  | $ | (15 | ) |  | $ | 3 |  |  | $ | — |  |  | $ | 700 |  |  | $ | (15 | )
Mortgage-backed securities | 1,528 |  |  | (31 | ) |  | 3 |  |  | — |  |  | 1,531 |  |  | (31 | )
Tax-exempt municipal securities | 2,756 |  |  | (67 | ) |  | 43 |  |  | (1 | ) |  | 2,799 |  |  | (68 | )
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Residential | — |  |  | — |  |  | 4 |  |  | — |  |  | 4 |  |  | — |
Commercial | 182 |  |  | (3 | ) |  | 24 |  |  | (1 | ) |  | 206 |  |  | (4 | )
Asset-backed securities | 51 |  |  | — |  |  | 63 |  |  | — |  |  | 114 |  |  | — |
Corporate debt securities | 1,544 |  |  | (71 | ) |  | 69 |  |  | (7 | ) |  | 1,613 |  |  | (78 | )
Total debt securities | $ | 6,758 |  |  | $ | (187 | ) |  | $ | 209 |  |  | $ | (9 | ) |  | $ | 6,967 |  |  | $ | (196 | )
Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income | The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the three and six months ended June 30, 2017 and 2016:
| Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in millions)
Gross realized gains | $ | 4 |  |  | $ | 20 |  |  | $ | 31 |  |  | $ | 51 |
Gross realized losses | (2 | ) |  | (1 | ) |  | (3 | ) |  | (12 | )
Net realized capital gains | $ | 2 |  |  | $ | 19 |  |  | $ | 28 |  |  | $ | 39 |
Schedule of Contractual Maturity of Debt Securities Available for Sale | The contractual maturities of debt securities available for sale at June 30, 2017, regardless of their balance sheet classification, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
| Amortized Cost |  | Fair Value
| (in millions)
Due within one year | $ | 538 |  |  | $ | 539 |
Due after one year through five years | 2,666 |  |  | 2,680 |
Due after five years through ten years | 2,237 |  |  | 2,235 |
Due after ten years | 3,101 |  |  | 3,248 |
Mortgage and asset-backed securities | 2,104 |  |  | 2,083 |
Total debt securities | $ | 10,646 |  |  | $ | 10,785 |

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