STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($)
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3 Months Ended |
5 Months Ended |
9 Months Ended |
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Mar. 13, 2015 |
Nov. 10, 2014 |
Nov. 07, 2014 |
Mar. 31, 2016 |
Mar. 13, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
Jul. 03, 2015 |
Sep. 30, 2014 |
Aug. 31, 2014 |
| Equity, Class of Treasury Stock [Line Items] |
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| Recognition of tax benefit in net income |
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$ 20,000,000
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| Share repurchase authorization |
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$ 1,000,000,000
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| Remaining authorized amount |
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$ 816,000,000
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| Common shares acquired in connection with employee stock plans, shares |
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450,000
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310,000
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| Common shares acquired in connection with employee stock plans, amount |
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$ 75,000,000
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$ 51,000,000
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| Treasury stock reissued (shares) |
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1,230,000
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| Treasury stock reissued |
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$ 81,000,000
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| Accumulated other comprehensive income |
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112,000,000
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$ 58,000,000
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| Net unrealized gains on our investment securities |
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| Equity, Class of Treasury Stock [Line Items] |
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| Accumulated other comprehensive income |
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226,000,000
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58,000,000
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| Additional liability that would exist on closed block of long-term care policies assuming unrealized gains on investments backing such products were realized and reinvested at current yields |
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| Equity, Class of Treasury Stock [Line Items] |
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| Accumulated other comprehensive income |
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$ 114,000,000
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$ 0
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| September 2014 Share Repurchase Authorization |
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| Equity, Class of Treasury Stock [Line Items] |
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| Share repurchase authorization |
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$ 2,000,000,000
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| Remaining authorized amount |
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$ 1,040,000,000
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| Expiration date of new authorization |
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Dec. 31, 2016
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| Value of shares repurchased |
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$ 329,000,000
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| Shares repurchased in open market |
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0
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1,850,000
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| Accelerated Share Repurchase Agreement |
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| Equity, Class of Treasury Stock [Line Items] |
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| Share repurchase authorization |
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$ 500,000,000
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| Value of shares repurchased |
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$ 400,000,000
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$ 500,000,000
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| Shares repurchased in open market |
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3,060,000
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3,420,000
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| Decrease in capital in excess of par value |
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$ 100,000,000
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| ASR, shares received |
360,000
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| Shares repurchased in open market, average price |
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$ 146.21
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