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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 | (233) |  |  |  | (233) |  |
Dividends to preferred stockholders | (14) |  |  |  | (14) |  |
Treasury stock purchased (in shares) |  |  | (13,000,000) |  |  |  |
Treasury stock purchased | (485) |  |  | 25 |  | (510) |
Share-based compensation plans (in shares) |  |  | 1,000,000 |  |  |  |
Share-based compensation plans | 12 |  |  | 12 |  | 0 |
Employee stock purchase plan shares purchased | 9 |  |  | 9 |  |  |
Total comprehensive income: |  |  |  |  |  |  |
Net income | 986 |  |  |  | 986 |  |
Other comprehensive loss | 87 |  |  |  |  |  | 87
Total comprehensive income | 1,073 |  |  |  | 986 |  | 87
Ending balance (in shares) at Sep. 30, 2017 |  | 0 | 500,000,000 |  |  |  |
Ending balance at Sep. 30, 2017 | 20,109 | $ 247 | $ 6 | 18,768 | 3,442 | (1,773) | (581)
Beginning balance at Jun. 30, 2017 |  |  |  |  |  |  | (593)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Dividends to preferred stockholders | (7) |  |  |  |  |  |
Treasury stock purchased | (225) |  |  |  |  |  |
Total comprehensive income: |  |  |  |  |  |  |
Net income | 348 |  |  |  |  |  |
Other comprehensive loss | 12 |  |  |  |  |  |
Total comprehensive income | 360 |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2017 |  | 0 | 500,000,000 |  |  |  |
Ending balance at Sep. 30, 2017 | 20,109 | $ 247 | $ 6 | 18,768 | 3,442 | (1,773) | (581)
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 | (344) |  |  |  | (344) |  |
Dividends to preferred stockholders | (14) |  |  |  | (14) |  |
Preferred stock issued (in shares) |  | 1,000,000 |  |  |  |  |
Preferred stock issued | $ 296 | $ 296 |  |  |  |  |
Treasury stock purchased (in shares) | (17,527,586) |  | (18,000,000) |  |  |  |
Treasury stock purchased | $ (725) |  |  | 0 |  | (725) |
Share-based compensation plans (in shares) |  |  | 1,000,000 |  |  |  |
Share-based compensation plans | 24 |  |  | 24 |  |  |
Employee stock purchase plan shares purchased | 11 |  |  | 11 |  |  |
Total comprehensive income: |  |  |  |  |  |  |
Net income | 1,256 |  |  |  | 1,256 |  |
Other comprehensive loss | (498) |  |  |  |  |  | (498)
Total comprehensive income | 758 |  |  |  | 1,256 |  | (498)
Ending balance (in shares) at Sep. 30, 2018 |  | 1,000,000 | 474,000,000 |  |  |  |
Ending balance at Sep. 30, 2018 | 20,276 | $ 543 | $ 6 | 18,816 | 5,062 | (2,833) | (1,318)
Beginning balance at Jun. 30, 2018 |  |  |  |  |  |  | (1,210)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Dividends to preferred stockholders | (7) |  |  |  |  |  |
Treasury stock purchased | (400) |  |  |  |  |  |
Total comprehensive income: |  |  |  |  |  |  |
Net income | 443 |  |  |  |  |  |
Other comprehensive loss | (108) |  |  |  |  |  |
Total comprehensive income | 335 |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2018 |  | 1,000,000 | 474,000,000 |  |  |  |
Ending balance at Sep. 30, 2018 | $ 20,276 | $ 543 | $ 6 | $ 18,816 | $ 5,062 | $ (2,833) | $ (1,318)

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