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Consolidated Statements of Changes in Equity - USD ($) $ in Millions | Total | Series D Preferred Stock [Member] | Series E Preferred Stock [Member] | Series F Preferred Stock [Member] | Series G Preferred Stock [Member] | Preferred Stock [Member] | Common Stock [Member] | Capital Surplus [Member] | Retained Earnings [Member] | Retained Earnings [Member] Series A Preferred Stock [Member] | Retained Earnings [Member] Series C Preferred Stock [Member] | Retained Earnings [Member] Series D Preferred Stock [Member] | Retained Earnings [Member] Series E Preferred Stock [Member] | Retained Earnings [Member] Series F Preferred Stock [Member] | Retained Earnings [Member] Series G Preferred Stock [Member] | Treasury Stock, at Cost [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interests [Member]
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Beginning Balance, Preferred Shares (in shares) at Dec. 31, 2016 |  |  |  |  |  | 17,421,000 |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, Common Shares (in shares) at Dec. 31, 2016 |  |  |  |  |  |  | 1,079,314,000 |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2016 |  |  |  |  |  | $ 1,665 | $ 1,257 | $ 6,385 | $ 9,378 |  |  |  |  |  |  | $ (2,904) | $ (541) | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 1,298 |  |  |  |  |  |  |  | 1,296 |  |  |  |  |  |  |  |  | 2
Other comprehensive income (loss) | (238) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (238) |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate |  |  |  |  |  |  |  |  | 141 |  |  |  |  |  |  |  |  |
Deferred compensation |  |  |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |
Dividends, Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares |  |  |  |  |  |  |  |  | (410) |  |  |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  |  |  |  |  |  |  |  |  | $ (6) | $ (7) | $ (26) | $ (31) |  |  |  |  |
Open market Common Share repurchases (in shares) |  |  |  |  |  |  | (36,140,000) |  |  |  |  |  |  |  |  |  |  |
Open market Common Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (665) |  |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  | (3,520,000) |  |  |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (65) |  |
Series A Preferred Stock exchanged for Common Shares (in shares) |  |  |  |  |  | (2,900,000) | 20,568,000 |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock exchanged for Common Shares |  |  |  |  |  | $ (290) |  | (49) |  |  |  |  |  |  |  | 338 |  |
Redemption of Series C Preferred Stock (in shares) |  |  |  |  |  | (14,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Redemption of Series C Preferred Stock |  |  |  |  |  | $ (350) |  |  |  |  |  |  |  |  |  |  |  |
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  | 8,862,000 |  |  |  |  |  |  |  |  |  |  |
Common Shares reissued (returned) for stock options and other employee benefit plans |  |  |  |  |  |  |  | (17) |  |  |  |  |  |  |  | 146 |  |
Net contribution from (distribution to) noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Ending Balance, Preferred Shares (in shares) at Dec. 31, 2017 |  |  |  |  |  | 521,000 |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, Common Shares (in shares) at Dec. 31, 2017 |  |  |  |  |  |  | 1,069,084,000 |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2017 |  |  |  |  |  | $ 1,025 | $ 1,257 | 6,335 | 10,335 |  |  |  |  |  |  | (3,150) | (779) | 2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other reclassification of AOCI |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  |  |  |  |
Net income (loss) | 1,866 |  |  |  |  |  |  |  | 1,866 |  |  |  |  |  |  |  |  | 0
Other comprehensive income (loss) | (39) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (39) |
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate | (13) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation |  |  |  |  |  |  |  | 21 |  |  |  |  |  |  |  |  |  |
Dividends, Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares |  |  |  |  |  |  |  |  | (590) |  |  |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  | (26) | (31) | $ (9) |  |  |  |
Issuance of Preferred Stock (in shares) |  |  |  |  |  | 425,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Preferred Stock |  |  |  |  |  | $ 425 |  | (13) |  |  |  |  |  |  |  |  |  |
Open market Common Share repurchases (in shares) |  |  |  |  |  |  | (54,006,000) |  |  |  |  |  |  |  |  |  |  |
Open market Common Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,098) |  |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  | (2,286,000) |  |  |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (47) |  |
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  | 6,711,000 |  |  |  |  |  |  |  |  |  |  |
Common Shares reissued (returned) for stock options and other employee benefit plans |  |  |  |  |  |  |  | (12) |  |  |  |  |  |  |  | 114 |  |
Net contribution from (distribution to) noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1)
Ending Balance, Preferred Shares (in shares) at Dec. 31, 2018 |  |  |  |  |  | 946,000 |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, Common Shares (in shares) at Dec. 31, 2018 |  |  |  |  |  |  | 1,019,503,000 |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2018 | 15,596 |  |  |  |  | $ 1,450 | $ 1,257 | 6,331 | 11,556 |  |  |  |  |  |  | (4,181) | (818) | 1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 1,717 |  |  |  |  |  |  |  | 1,717 |  |  |  |  |  |  |  |  | 0
Other comprehensive income (loss) | 844 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 844 |
Deferred compensation |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |
Dividends, Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares |  |  |  |  |  |  |  |  | (707) |  |  |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  | $ (26) | $ (31) | $ (24) | $ (16) |  |  |
Issuance of Preferred Stock (in shares) |  |  |  |  |  | 450,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Preferred Stock |  |  |  |  |  | $ 450 |  | (15) |  |  |  |  |  |  |  |  |  |
Open market Common Share repurchases (in shares) |  |  |  |  |  |  | (48,347,000) |  |  |  |  |  |  |  |  |  |  |
Open market Common Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (835) |  |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  | (1,901,000) |  |  |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  | (33) |  |
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  | 7,934,000 |  |  |  |  |  |  |  |  |  |  |
Common Shares reissued (returned) for stock options and other employee benefit plans |  |  |  |  |  |  |  | (28) |  |  |  |  |  |  |  | 140 |  |
Net contribution from (distribution to) noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1)
Ending Balance, Preferred Shares (in shares) at Dec. 31, 2019 |  | 21,000 | 500,000 | 425,000 | 450,000 | 1,396,000 |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, Common Shares (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | 977,189,000 |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2019 | $ 17,038 |  |  |  |  | $ 1,900 | $ 1,257 | $ 6,295 | $ 12,469 |  |  |  |  |  |  | $ (4,909) | $ 26 | $ 0

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