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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 29, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |
Number of shares issued (in shares) |  | 850,000 | 250,000 |
Redemption period |  | 90 days |  |
Redemption price per share (in dollars per share) |  | $ 1,000 |  |
Cost of stock repurchase |  | $ 1,025,000,000 | $ 820,000,000 | $ 430,000,000
Treasury stock purchased (in shares) |  | 25,773,807 | 22,362,401 |
Treasury stock purchased, price per share (in dollars per share) |  | $ 39.77 | $ 36.67 |
Treasury stock purchased |  | $ 1,025,000,000 | $ 820,000,000 | 430,000,000
Treasury Stock, at Cost |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury stock purchased |  | 1,025,000,000 | 845,000,000 | 405,000,000
Additional Paid-in Capital |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury stock purchased |  | $ 0 | $ (25,000,000) | $ 25,000,000
Deferred compensation, share-based payments |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares repurchased (in shares) |  | 0 | 0 |
Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Redemption period | 90 days |  |  |
Series D Preferred Stock | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock issued | $ 300,000,000 |  |  |
Number of shares issued (in shares) | 12,000,000 |  |  |
Percentage interest in shares | 2.50% |  |  |
Preferred stock, dividend rate | 6.35% |  |  |
Preferred stock, liquidation preference (in dollars per share) | $ 1,000 |  |  |
Shares issued (in dollars per share) | $ 25 |  |  |
Proceeds from issuance of stock | $ 293,000,000 |  |  |
Redemption price per share (in dollars per share) | $ 1,000 |  |  |
LIBOR | Series D Preferred Stock | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Basis spread on variable rate | 3.642% |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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