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STOCKHOLDERS' EQUITY - Authorized Preferred Shares (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
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Mar. 31, 2020 | Dec. 31, 2019
Preferred Stock |  |
Preferred stock, authorized (in shares) | 100,000,000 | 100,000,000
Preferred stock, par value (in dollars per share) | $ 25.00 | $ 25.00
Preferred stock, issued (in shares) | 1,600,000 | 1,600,000
Preferred stock, value, issued | $ 1,570 | $ 1,570
Series A Preferred Stock |  |
Preferred Stock |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |
Preferred stock, issued (in shares) | 250,000 | 250,000
Preferred stock, value, issued | $ 247 | $ 247
Series B Preferred Stock |  |
Preferred Stock |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |
Preferred stock, issued (in shares) | 300,000 | 300,000
Preferred stock, value, issued | $ 296 | $ 296
Series C Preferred Stock |  |
Preferred Stock |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |
Preferred stock, issued (in shares) | 300,000 | 300,000
Preferred stock, value, issued | $ 297 | $ 297
Series D Preferred Stock |  |
Preferred Stock |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |
Preferred stock, issued (in shares) | 300,000 | 300,000
Preferred stock, value, issued | $ 293 | $ 293
Liquidation preference per depository share (usd per share) | $ 25 |
Depositary shares issued (in shares) | 12,000,000 |
Depository share interest percentage | 2.50% |
Series E Preferred Stock |  |
Preferred Stock |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |
Preferred stock, issued (in shares) | 450,000 | 450,000
Preferred stock, value, issued | $ 437 | $ 437
Liquidation preference per depository share (usd per share) | $ 25 |
Depositary shares issued (in shares) | 18,000,000 |
Depository share interest percentage | 2.50% |

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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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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: 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 + 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://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 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: 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 + Details
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