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CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions | Total | Common stock | Additional Paid In Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 | $ 10,601 | $ 1,269 | $ 5,889 | $ 3,553 | $ (110)
Balance (in shares) at Dec. 31, 2015 |  | 507,536 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income | 1,123 |  |  | 1,123 |
Other comprehensive income (loss) | 0 |  |  |  |
Dividends declared on common stock | (694) |  |  | (694) |
Issuances of common stock (in shares) |  | 486 |  |  |
Issuances of common stock | 16 | $ 1 | 15 |  |
Stock Repurchased During Period, Shares |  | (799) |  |  |
Repurchases of common stock | (32) | $ (2) | (30) |  |
Share-based compensation | 7 |  | 7 |  |
Ending balance at Dec. 31, 2016 | $ 11,021 | $ 1,268 | 5,881 | 3,982 | (110)
Balance (in shares) at Dec. 31, 2016 |  | 507,223 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Dividends declared on common stock | $ (1.36) |  |  |  |
Net income | $ 1,148 |  |  | 1,148 |
Other comprehensive income (loss) | 7 |  |  |  | 7
Dividends declared on common stock | (736) |  |  | (736) |
Issuances of common stock (in shares) |  | 611 |  |  |
Issuances of common stock | 5 | $ 1 | 4 |  |
Stock Repurchased During Period, Shares |  | (71) |  |  |
Repurchases of common stock | (3) | $ 0 | (3) |  |
Share-based compensation | 13 |  | 16 | (3) |
Adoption of ASU No. 2018-02 | 0 |  |  | 22 | (22)
Ending balance at Dec. 31, 2017 | $ 11,455 | $ 1,269 | 5,898 | 4,413 | (125)
Balance (in shares) at Dec. 31, 2017 |  | 507,763 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Dividends declared on common stock | $ (1.44) |  |  |  |
Net income | $ 1,261 |  |  | 1,261 |
Other comprehensive income (loss) | 1 |  |  |  | 1
Dividends declared on common stock | (780) |  |  | (780) |
Issuances of common stock (in shares) |  | 6,296 |  |  |
Issuances of common stock | 270 | $ 16 | 254 |  |
Repurchases of common stock (in shares) |  | (22) |  |  |
Repurchases of common stock | (1) | $ 0 | (1) |  |
Share-based compensation | 16 |  | 17 | (1) |
Ending balance at Dec. 31, 2018 | $ 12,222 | $ 1,285 | $ 6,168 | $ 4,893 | $ (124)
Balance (in shares) at Dec. 31, 2018 |  | 514,037 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Dividends declared on common stock | $ (1.52) |  |  |  |

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