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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions | Total | Preferred Stock [Member] | Common Stock | Additional Paid-in Capital | Retained Earnings | Treasury Stock | AOCI Attributable to Parent [Member] | Share-based Payment Arrangement [Member] Treasury Stock | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Retained Earnings
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 |  |  |  | $ 4,312 | $ 12,685 | $ (1,117) | $ 52 |  |  | $ 12,667
Beginning balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019 |  |  |  |  |  |  |  |  | $ (18) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (84) |  |  |  |  |  |
Stock-based compensation plans expense |  |  |  | 71 |  |  |  |  |  |
Net income | $ 741 |  |  |  | 741 |  |  |  |  |
Dividends declared on preferred stock | (10) |  |  |  | (10) |  |  |  |  |
Dividends declared on common stock |  |  |  |  | (231) |  |  |  |  |
Treasury stock acquired | (150) |  |  |  |  | (150) |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  |  |  |  |  | $ 91 |  |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  | (35) |  |  |  |
Total other comprehensive income |  |  |  |  |  |  | 427 |  |  |
Ending balance at Jun. 30, 2020 | $ 17,072 | $ 334 | $ 4 | 4,299 | 13,167 | (1,211) | 479 |  |  |
Preferred Shares Outstanding, beginning of period at Dec. 31, 2019 |  | 13,800 |  |  |  |  |  |  |  |
Preferred Shares Outstanding |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares |  | 0 |  |  |  |  |  |  |  |
Preferred Shares Outstanding, end of period at Jun. 30, 2020 |  | 13,800 |  |  |  |  |  |  |  |
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2019 |  |  | 359,570 |  |  |  |  |  |  |
Shares Granted or Issued, Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |  |  |
Treasury stock acquired | (2,700) |  | (2,661) |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 1,860 |  |  |  |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (670) |  |  |  |  |  |  |
Common Shares Outstanding, at end of period at Jun. 30, 2020 |  |  | 358,099 |  |  |  |  |  |  |
Shares Granted or Issued, Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.650 |  |  |  |  |  |  |  |  |
Cash dividends declared per preferred share | $ 750.00 |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 |  |  |  | 4,286 | 12,819 | (1,220) | (957) |  |  | 12,819
Beginning balance (Accounting Standards Update 2016-13 [Member]) at Mar. 31, 2020 |  |  |  |  |  |  |  |  | 0 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (5) |  |  |  |  |  |
Stock-based compensation plans expense |  |  |  | 18 |  |  |  |  |  |
Net income | $ 468 |  |  |  | 468 |  |  |  |  |
Dividends declared on preferred stock | (5) |  |  |  | (5) |  |  |  |  |
Dividends declared on common stock |  |  |  |  | (115) |  |  |  |  |
Treasury stock acquired |  |  |  |  |  | 0 |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  |  |  |  |  | 9 |  |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  | 0 |  |  |  |
Total other comprehensive income |  |  |  |  |  |  | 1,436 |  |  |
Ending balance at Jun. 30, 2020 | $ 17,072 | $ 334 | $ 4 | 4,299 | 13,167 | (1,211) | 479 |  |  |
Preferred Shares Outstanding, beginning of period at Mar. 31, 2020 |  | 13,800 |  |  |  |  |  |  |  |
Preferred Shares Outstanding |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares |  | 0 |  |  |  |  |  |  |  |
Preferred Shares Outstanding, end of period at Jun. 30, 2020 |  | 13,800 |  |  |  |  |  |  |  |
Common Shares Outstanding, beginning of period (in thousands) at Mar. 31, 2020 |  |  | 357,934 |  |  |  |  |  |  |
Shares Granted or Issued, Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |  |  |
Treasury stock acquired |  |  | 0 |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 175 |  |  |  |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (10) |  |  |  |  |  |  |
Common Shares Outstanding, at end of period at Jun. 30, 2020 |  |  | 358,099 |  |  |  |  |  |  |
Shares Granted or Issued, Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.325 |  |  |  |  |  |  |  |  |
Cash dividends declared per preferred share | $ 375.00 |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2020 | $ 18,556 |  |  | 4,322 | 13,918 | (1,192) | 1,170 |  | 0 | 13,918
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (71) |  |  |  |  |  |
Stock-based compensation plans expense |  |  |  | 79 |  |  |  |  |  |
Net income | 1,154 |  |  |  | 1,154 |  |  |  |  |
Dividends declared on preferred stock | (10) |  |  |  | (10) |  |  |  |  |
Dividends declared on common stock |  |  |  |  | (249) |  |  |  |  |
Treasury stock acquired | (691) |  |  |  |  | (691) |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  |  |  |  |  | 102 |  |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  | (26) |  |  |  |
Total other comprehensive income |  |  |  |  |  |  | (600) |  |  |
Ending balance at Jun. 30, 2021 | $ 18,244 | $ 334 | $ 4 | 4,330 | 14,813 | (1,807) | 570 |  |  |
Preferred Shares Outstanding, beginning of period at Dec. 31, 2020 |  | 13,800 |  |  |  |  |  |  |  |
Preferred Shares Outstanding |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares |  | 0 |  |  |  |  |  |  |  |
Preferred Shares Outstanding, end of period at Jun. 30, 2021 |  | 13,800 |  |  |  |  |  |  |  |
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2020 |  |  | 358,489 |  |  |  |  |  |  |
Shares Granted or Issued, Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |  |  |
Treasury stock acquired | (11,000) |  | (11,036) |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 2,057 |  |  |  |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (512) |  |  |  |  |  |  |
Common Shares Outstanding, at end of period at Jun. 30, 2021 |  |  | 348,998 |  |  |  |  |  |  |
Shares Granted or Issued, Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.700 |  |  |  |  |  |  |  |  |
Cash dividends declared per preferred share | $ 750.00 |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2021 |  |  |  | 4,310 | 14,036 | (1,246) | 264 |  | $ 0 | $ 14,036
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (2) |  |  |  |  |  |
Stock-based compensation plans expense |  |  |  | 22 |  |  |  |  |  |
Net income | $ 905 |  |  |  | 905 |  |  |  |  |
Dividends declared on preferred stock | (5) |  |  |  | (5) |  |  |  |  |
Dividends declared on common stock |  |  |  |  | (123) |  |  |  |  |
Treasury stock acquired |  |  |  |  |  | (568) |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  |  |  |  |  | $ 8 |  |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  | (1) |  |  |  |
Total other comprehensive income |  |  |  |  |  |  | 306 |  |  |
Ending balance at Jun. 30, 2021 | $ 18,244 | $ 334 | $ 4 | $ 4,330 | $ 14,813 | $ (1,807) | $ 570 |  |  |
Preferred Shares Outstanding, beginning of period at Mar. 31, 2021 |  | 13,800 |  |  |  |  |  |  |  |
Preferred Shares Outstanding |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares |  | 0 |  |  |  |  |  |  |  |
Preferred Shares Outstanding, end of period at Jun. 30, 2021 |  | 13,800 |  |  |  |  |  |  |  |
Common Shares Outstanding, beginning of period (in thousands) at Mar. 31, 2021 |  |  | 357,517 |  |  |  |  |  |  |
Shares Granted or Issued, Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |  |  |
Treasury stock acquired |  |  | (8,650) |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 143 |  |  |  |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (12) |  |  |  |  |  |  |
Common Shares Outstanding, at end of period at Jun. 30, 2021 |  |  | 348,998 |  |  |  |  |  |  |
Shares Granted or Issued, Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.350 |  |  |  |  |  |  |  |  |
Cash dividends declared per preferred share | $ 375.00 |  |  |  |  |  |  |  |  |

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