| **Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions** | Total   | Common equities | Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income | Treasury Stock | Previously Reported Retained Earnings |
|-----------------------------------------------------------------------------------------------------------|---------|-----------------|-----------------|-------------------|----------------------------------------|----------------|---------------------------------------|
| Unrealized gains reclassified to retained earnings for ASU 2016-01, after tax                             |    |            |            | $ 0               |                                   |           |                                  |
| Beginning Balance at Dec. 31, 2018                                                                        |    | $ 397           | $ 1,281         | 7,625             | $ 22                                   | $ (1,492)      | $ 7,625                               |
| Share-based awards                                                                                        |    | 0               | (13)            |              |                                   | 16             |                                  |
| Share-based compensation                                                                                  |    |            | 16              |              |                                   |           |                                  |
| Other                                                                                                     |    |            | 2               |              |                                   | 1              |                                  |
| Net Income (Loss)                                                                                         | $ 1,123 |            |            | 1,123             |                                   |           |                                  |
| Dividends declared                                                                                        |    |            |            | (182)             |                                   |           |                                  |
| Other comprehensive income                                                                                | 342     |            |            |              | 342                                    |           |                                  |
| Shares acquired - share repurchase authorization                                                          |    |            |            |              |                                   | 0              |                                  |
| Shares acquired - share-based compensation plans                                                          |    |            |            |              |                                   | (7)            |                                  |
| Ending Balance at Jun. 30, 2019                                                                           | 9,131   | $ 397           | 1,286           | 8,566             | 364                                    | (1,482)        |                                  |
| Beginning Balance (in shares) at Dec. 31, 2018                                                            |    | 162.8           |            |              |                                   |           |                                  |
| Share-based awards (in shares)                                                                            |    | 0.5             |            |              |                                   |           |                                  |
| Shares acquired - share repurchase authorization (in shares)                                              |    | 0.0             |            |              |                                   |           |                                  |
| Ending Balance (in shares) at Jun. 30, 2019                                                               |    | 163.3           |            |              |                                   |           |                                  |
| Dividends declared per common share                                                                       |    | $ 1.12          |            |              |                                   |           |                                  |
| Increase to allowance through retained earnings for ASU 2016-13, after-tax                                |    |            |            | 0                 |                                   |           |                                  |
| Beginning Balance at Mar. 31, 2019                                                                        |    | $ 397           | 1,277           | 8,229             | 210                                    | (1,483)        | 8,229                                 |
| Share-based awards                                                                                        |    | 0               | 1               |              |                                   | 3              |                                  |
| Share-based compensation                                                                                  |    |            | 7               |              |                                   |           |                                  |
| Other                                                                                                     |    |            | 1               |              |                                   | 0              |                                  |
| Net Income (Loss)                                                                                         | 428     |            |            | 428               |                                   |           |                                  |
| Dividends declared                                                                                        |    |            |            | (91)              |                                   |           |                                  |
| Other comprehensive income                                                                                | 154     |            |            |              | 154                                    |           |                                  |
| Shares acquired - share repurchase authorization                                                          |    |            |            |              |                                   | 0              |                                  |
| Shares acquired - share-based compensation plans                                                          |    |            |            |              |                                   | (2)            |                                  |
| Ending Balance at Jun. 30, 2019                                                                           | 9,131   | $ 397           | 1,286           | 8,566             | 364                                    | (1,482)        |                                  |
| Beginning Balance (in shares) at Mar. 31, 2019                                                            |    | 163.2           |            |              |                                   |           |                                  |
| Share-based awards (in shares)                                                                            |    | 0.1             |            |              |                                   |           |                                  |
| Shares acquired - share repurchase authorization (in shares)                                              |    | 0.0             |            |              |                                   |           |                                  |
| Ending Balance (in shares) at Jun. 30, 2019                                                               |    | 163.3           |            |              |                                   |           |                                  |
| Dividends declared per common share                                                                       |    | $ 0.56          |            |              |                                   |           |                                  |
| Increase to allowance through retained earnings for ASU 2016-13, after-tax                                | (2)     |            |            | (2)               |                                   |           |                                  |
| Beginning Balance at Dec. 31, 2019                                                                        | 9,864   | $ 397           | 1,306           | 9,255             | 448                                    | (1,544)        | 9,257                                 |
| Share-based awards                                                                                        |    | 0               | (16)            |              |                                   | 12             |                                  |
| Share-based compensation                                                                                  |    |            | 16              |              |                                   |           |                                  |
| Other                                                                                                     |    |            | 3               |              |                                   | 1              |                                  |
| Net Income (Loss)                                                                                         | (317)   |            |            | (317)             |                                   |           |                                  |
| Dividends declared                                                                                        |    |            |            | (193)             |                                   |           |                                  |
| Other comprehensive income                                                                                | 149     |            |            |              | 149                                    |           |                                  |
| Shares acquired - share repurchase authorization                                                          |    |            |            |              |                                   | (256)          |                                  |
| Shares acquired - share-based compensation plans                                                          |    |            |            |              |                                   | (3)            |                                  |
| Ending Balance at Jun. 30, 2020                                                                           | 9,258   | $ 397           | 1,309           | 8,745             | 597                                    | (1,790)        |                                  |
| Beginning Balance (in shares) at Dec. 31, 2019                                                            |    | 162.9           |            |              |                                   |           |                                  |
| Share-based awards (in shares)                                                                            |    | 0.4             |            |              |                                   |           |                                  |
| Shares acquired - share repurchase authorization (in shares)                                              |    | (2.5)           |            |              |                                   |           |                                  |
| Ending Balance (in shares) at Jun. 30, 2020                                                               |    | 160.8           |            |              |                                   |           |                                  |
| Dividends declared per common share                                                                       |    | $ 1.20          |            |              |                                   |           |                                  |
| Increase to allowance through retained earnings for ASU 2016-13, after-tax                                |    |            |            | 0                 |                                   |           |                                  |
| Beginning Balance at Mar. 31, 2020                                                                        |    | $ 397           | 1,300           | 7,932             | 204                                    | (1,791)        | $ 7,932                               |
| Share-based awards                                                                                        |    | 0               | 0               |              |                                   | 1              |                                  |
| Share-based compensation                                                                                  |    |            | 7               |              |                                   |           |                                  |
| Other                                                                                                     |    |            | 2               |              |                                   | 0              |                                  |
| Net Income (Loss)                                                                                         | 909     |            |            | 909               |                                   |           |                                  |
| Dividends declared                                                                                        |    |            |            | (96)              |                                   |           |                                  |
| Other comprehensive income                                                                                | 393     |            |            |              | 393                                    |           |                                  |
| Shares acquired - share repurchase authorization                                                          |    |            |            |              |                                   | 0              |                                  |
| Shares acquired - share-based compensation plans                                                          |    |            |            |              |                                   | 0              |                                  |
| Ending Balance at Jun. 30, 2020                                                                           | $ 9,258 | $ 397           | $ 1,309         | $ 8,745           | $ 597                                  | $ (1,790)      |                                  |
| Beginning Balance (in shares) at Mar. 31, 2020                                                            |    | 160.8           |            |              |                                   |           |                                  |
| Share-based awards (in shares)                                                                            |    | 0.0             |            |              |                                   |           |                                  |
| Shares acquired - share repurchase authorization (in shares)                                              |    | 0.0             |            |              |                                   |           |                                  |
| Ending Balance (in shares) at Jun. 30, 2020                                                               |    | 160.8           |            |              |                                   |           |                                  |
| Dividends declared per common share                                                                       |    | $ 0.60          |            |              |                                   |           |                                  |

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Unrealized gains on equity securities reclassified from accumulated other comprehensive income to retained earnings, after tax upon adoption of ASU 2016-01.
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Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.
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Aggregate dividends declared during the period for each share of common stock outstanding.
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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Number of share options (or share units) exercised during the current period.
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Value of stock issued as a result of the exercise of stock options.
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
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Number of shares that have been repurchased during the period and are being held in treasury.
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
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