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STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 24, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Preferred Stock |  |  |  |
Preferred stock, authorized (in shares) |  | 100,000,000 |  | 100,000,000
Preferred stock, outstanding (in shares) |  | 550,000 |  | 250,000
Preferred stock, par value (in dollars per share) |  | $ 25.00 |  | $ 25.00
Preferred stock, shares issued (in shares) |  | 550,000 |  | 250,000
Preferred stock, carrying amount |  | $ 543 |  | $ 247
Preferred stock issued |  | 296 |  |
Treasury Stock |  |  |  |
Treasury stock purchased |  | $ 325 | $ 260 |
Treasury stock purchased (in shares) |  | 7,486,165 |  |
Noncumulative Preferred Stock |  |  |  |
Preferred Stock |  |  |  |
Preferred stock, par value (in dollars per share) | $ 25 |  |  |
Preferred stock issued | $ 300 |  |  |
Preferred stock issued (in shares) | 300,000 |  |  |
Preferred stock, dividend rate | 6.00% |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |  |  |
Preferred stock, redemption notice period | 90 days |  |  |
Preferred stock, redemption price per share (in dollars per share) | $ 1,000 |  |  |
Carrying amount of preferred stock | $ 296 |  |  |
Series A Preferred Stock |  |  |  |
Preferred Stock |  |  |  |
Preferred stock, shares issued (in shares) |  | 250,000 |  | 250,000
Preferred stock, dividend rate |  | 5.50% |  | 5.50%
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 |  | $ 1,000
Carrying amount of preferred stock |  | $ 247 |  | $ 247
LIBOR | Noncumulative Preferred Stock |  |  |  |
Preferred Stock |  |  |  |
Preferred stock, dividend payment rate, basis spread on variable rate | 3.003% |  |  |

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- Definition Period which shares may be redeemed following a regulatory capital treatment event, in ‘PnYnMnDTnHnMnS’ format, for example, ‘P0Y0M90D’ represents the reported fact of 90 days. + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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