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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions | Total | Preferred Stock | Common Stock | Additional Paid-in Capital | Retained Earnings | Treasury Stock, at Cost | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2016 |  | 0 | 512,000,000 |  |  |  |
Beginning balance at Dec. 31, 2016 | $ 19,747 | $ 247 | $ 6 | $ 18,722 | $ 2,703 | $ (1,263) | $ (668)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Dividends to common stockholders | (143) |  |  |  | (143) |  |
Dividends to preferred stockholders | (7) |  |  |  | (7) |  |
Treasury stock purchased (in shares) |  |  | (7,000,000) |  |  |  |
Treasury stock purchased | (260) |  |  | 25 |  | (285) |
Share-based compensation plans (in shares) |  |  | 1,000,000 |  |  |  |
Share-based compensation plans | 8 |  |  | 8 |  | 0 |
Employee stock purchase plan shares purchased | 6 |  |  | 6 |  |  |
Total comprehensive income: |  |  |  |  |  |  |
Net income | 638 |  |  |  | 638 |  |
Other comprehensive loss | 75 |  |  |  |  |  | 75
Total comprehensive income | 713 |  |  |  | 638 |  | 75
Ending balance (in shares) at Jun. 30, 2017 |  | 0 | 506,000,000 |  |  |  |
Ending balance at Jun. 30, 2017 | 20,064 | $ 247 | $ 6 | 18,761 | 3,191 | (1,548) | (593)
Beginning balance at Mar. 31, 2017 |  |  |  |  |  |  | (683)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Dividends to preferred stockholders | (7) |  |  |  |  |  |
Treasury stock purchased | (130) |  |  |  |  |  |
Total comprehensive income: |  |  |  |  |  |  |
Net income | 318 |  |  |  |  |  |
Other comprehensive loss | 90 |  |  |  |  |  |
Total comprehensive income | 408 |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2017 |  | 0 | 506,000,000 |  |  |  |
Ending balance at Jun. 30, 2017 | 20,064 | $ 247 | $ 6 | 18,761 | 3,191 | (1,548) | (593)
Beginning balance (in shares) at Dec. 31, 2017 |  | 0 | 491,000,000 |  |  |  |
Beginning balance at Dec. 31, 2017 | 20,270 | $ 247 | $ 6 | 18,781 | 4,164 | (2,108) | (820)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Dividends to common stockholders | (215) |  |  |  | (215) |  |
Dividends to preferred stockholders | (7) |  |  |  | (7) |  |
Preferred stock issued (in shares) |  | 1,000,000 |  |  |  |  |
Preferred stock issued | $ 296 | $ 296 |  |  |  |  |
Treasury stock purchased (in shares) | (7,486,165) |  | (8,000,000) |  |  |  |
Treasury stock purchased | $ (325) |  |  | 0 |  | (325) |
Share-based compensation plans (in shares) |  |  | 1,000,000 |  |  |  |
Share-based compensation plans | 18 |  |  | 18 |  | 0 |
Employee stock purchase plan shares purchased | 7 |  |  | 7 |  |  |
Total comprehensive income: |  |  |  |  |  |  |
Net income | 813 |  |  |  | 813 |  |
Other comprehensive loss | (390) |  |  |  |  |  | (390)
Total comprehensive income | 423 |  |  |  | 813 |  | (390)
Ending balance (in shares) at Jun. 30, 2018 |  | 1,000,000 | 484,000,000 |  |  |  |
Ending balance at Jun. 30, 2018 | 20,467 | $ 543 | $ 6 | 18,806 | 4,755 | (2,433) | (1,210)
Beginning balance at Mar. 31, 2018 |  |  |  |  |  |  | (1,145)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Dividends to preferred stockholders | (7) |  |  |  |  |  |
Treasury stock purchased | (150) |  |  |  |  |  |
Total comprehensive income: |  |  |  |  |  |  |
Net income | 425 |  |  |  |  |  |
Other comprehensive loss | (65) |  |  |  |  |  |
Total comprehensive income | 360 |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2018 |  | 1,000,000 | 484,000,000 |  |  |  |
Ending balance at Jun. 30, 2018 | $ 20,467 | $ 543 | $ 6 | $ 18,806 | $ 4,755 | $ (2,433) | $ (1,210)

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