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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Millions | Total | Open Market Repurchases [Member] | Common Stock [Member] | Treasury Stock [Member] | Treasury Stock [Member] Open Market Repurchases [Member] | Common Stock Shares Outstanding [Member] | Common Stock Shares Outstanding [Member] Open Market Repurchases [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Total Stockholders' Equity [Member] | Total Stockholders' Equity [Member] Open Market Repurchases [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance, Value at Dec. 31, 2017 | $ 3,485 |  | $ 4 | $ (2,692) |  |  |  | $ 3,077 | $ 61 | $ 3,004 | $ 3,454 |  | $ 31
Beginning Balance, Shares at Dec. 31, 2017 |  |  | 439,718,145 | (176,667,573) |  | 263,050,572 |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 210 |  |  |  |  |  |  |  |  | 210 | 210 |  |
Other comprehensive income (loss), net of tax | 129 |  |  |  |  |  |  |  | 129 |  | 129 |  |
Total comprehensive income | 339 |  |  |  |  |  |  |  |  |  | 339 |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock | (85) |  |  |  |  |  |  |  |  | (85) | (85) |  |
Dividend equivalent units related to employee stock-based compensation plans | (2) |  |  |  |  |  |  |  |  | (2) | (2) |  |
Issuance of common shares | $ 39 |  |  |  |  |  |  | 39 |  |  | 39 |  |
Issuance of common shares, Shares | 5,134,238 |  | 5,134,238 |  |  | 5,134,238 |  |  |  |  |  |  |
Stock-based compensation expense | $ 18 |  |  |  |  |  |  | 18 |  |  | 18 |  |
Common stock repurchased, Shares |  |  |  |  |  | 0 |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | $ (49) |  |  | $ (49) |  |  |  |  |  |  | (49) |  |
Shares repurchased related to employee stock-based compensation plans, Shares | (3,557,504) |  |  | (3,557,504) |  | (3,557,504) |  |  |  |  |  |  |
Reclassification from adoption of ASU No. 2018-02 |  |  |  |  |  |  |  |  | 13 | (13) |  |  |
Ending Balance, Value at Jun. 30, 2018 | $ 3,745 |  | $ 4 | $ (2,741) |  |  |  | 3,134 | 203 | 3,114 | 3,714 |  | 31
Ending Balance, Shares at Jun. 30, 2018 |  |  | 444,852,383 | (180,225,077) |  | 264,627,306 |  |  |  |  |  |  |
Beginning Balance, Value at Mar. 31, 2018 | 3,668 |  | $ 4 | $ (2,740) |  |  |  | 3,127 | 173 | 3,073 | 3,637 |  | 31
Beginning Balance, Shares at Mar. 31, 2018 |  |  | 444,739,212 | (180,132,708) |  | 264,606,504 |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 83 |  |  |  |  |  |  |  |  | 83 | 83 |  |
Other comprehensive income (loss), net of tax | 30 |  |  |  |  |  |  |  | 30 |  | 30 |  |
Total comprehensive income | 113 |  |  |  |  |  |  |  |  |  | 113 |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock | (42) |  |  |  |  |  |  |  |  | (42) | (42) |  |
Issuance of common shares | $ 1 |  |  |  |  |  |  | 1 |  |  | 1 |  |
Issuance of common shares, Shares | 113,171 |  | 113,171 |  |  | 113,171 |  |  |  |  |  |  |
Stock-based compensation expense | $ 6 |  |  |  |  |  |  | 6 |  |  | 6 |  |
Shares repurchased related to employee stock-based compensation plans | $ (1) |  |  | $ (1) |  |  |  |  |  |  | (1) |  |
Shares repurchased related to employee stock-based compensation plans, Shares | (92,369) |  |  | (92,369) |  | (92,369) |  |  |  |  |  |  |
Ending Balance, Value at Jun. 30, 2018 | $ 3,745 |  | $ 4 | $ (2,741) |  |  |  | 3,134 | 203 | 3,114 | 3,714 |  | 31
Ending Balance, Shares at Jun. 30, 2018 |  |  | 444,852,383 | (180,225,077) |  | 264,627,306 |  |  |  |  |  |  |
Beginning Balance, Value at Dec. 31, 2018 | 3,547 |  | $ 4 | $ (2,961) |  |  |  | 3,145 | 113 | 3,218 | 3,519 |  | 28
Beginning Balance, Shares at Dec. 31, 2018 |  |  | 445,377,826 | (197,940,553) |  | 247,437,273 |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 281 |  |  |  |  |  |  |  |  | 281 | 281 |  |
Other comprehensive income (loss), net of tax | (193) |  |  |  |  |  |  |  | (193) |  | (193) |  |
Total comprehensive income | 88 |  |  |  |  |  |  |  |  |  | 88 |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock | (76) |  |  |  |  |  |  |  |  | (76) | (76) |  |
Dividend equivalent units related to employee stock-based compensation plans | (5) |  |  |  |  |  |  |  |  | (5) | (5) |  |
Issuance of common shares | $ 19 |  |  |  |  |  |  | 19 |  |  | 19 |  |
Issuance of common shares, Shares | 4,625,347 |  | 4,625,347 |  |  | 4,625,347 |  |  |  |  |  |  |
Stock-based compensation expense | $ 17 |  |  |  |  |  |  | 17 |  |  | 17 |  |
Common stock repurchased |  | $ (233) |  |  | $ (233) | $ (233) |  |  |  |  |  | $ (233) |
Common stock repurchased, Shares |  |  |  |  | (19,034,252) | (19,034,252) | (19,034,252) |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | $ (28) |  |  | $ (28) |  |  |  |  |  |  | (28) |  |
Shares repurchased related to employee stock-based compensation plans, Shares | (2,534,090) |  |  | (2,534,090) |  | (2,534,090) |  |  |  |  |  |  |
Net activity in noncontrolling interest | $ (17) |  |  |  |  |  |  |  |  |  |  |  | (17)
Ending Balance, Value at Jun. 30, 2019 | 3,312 |  | $ 4 | $ (3,222) |  |  |  | 3,181 | (80) | 3,418 | 3,301 |  | 11
Ending Balance, Shares at Jun. 30, 2019 |  |  | 450,003,173 | (219,508,895) |  | 230,494,278 |  |  |  |  |  |  |
Beginning Balance, Value at Mar. 31, 2019 | 3,443 |  | $ 4 | $ (3,094) |  |  |  | 3,174 | 43 | 3,303 | 3,430 |  | 13
Beginning Balance, Shares at Mar. 31, 2019 |  |  | 449,807,290 | (209,771,402) |  | 240,035,888 |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 153 |  |  |  |  |  |  |  |  | 153 | 153 |  |
Other comprehensive income (loss), net of tax | (123) |  |  |  |  |  |  |  | (123) |  | (123) |  |
Total comprehensive income | 30 |  |  |  |  |  |  |  |  |  | 30 |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock | (37) |  |  |  |  |  |  |  |  | (37) | (37) |  |
Dividend equivalent units related to employee stock-based compensation plans | (1) |  |  |  |  |  |  |  |  | (1) | (1) |  |
Issuance of common shares | $ 2 |  |  |  |  |  |  | 2 |  |  | 2 |  |
Issuance of common shares, Shares | 195,883 |  | 195,883 |  |  | 195,883 |  |  |  |  |  |  |
Stock-based compensation expense | $ 5 |  |  |  |  |  |  | 5 |  |  | 5 |  |
Common stock repurchased |  | $ (126) |  |  | $ (126) | $ (126) |  |  |  |  |  | $ (126) |
Common stock repurchased, Shares |  |  |  |  | (9,617,008) | (9,617,008) | (9,617,008) |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | $ (2) |  |  | $ (2) |  |  |  |  |  |  | (2) |  |
Shares repurchased related to employee stock-based compensation plans, Shares | (120,485) |  |  | (120,485) |  | (120,485) |  |  |  |  |  |  |
Net activity in noncontrolling interest | $ (2) |  |  |  |  |  |  |  |  |  |  |  | (2)
Ending Balance, Value at Jun. 30, 2019 | $ 3,312 |  | $ 4 | $ (3,222) |  |  |  | $ 3,181 | $ (80) | $ 3,418 | $ 3,301 |  | $ 11
Ending Balance, Shares at Jun. 30, 2019 |  |  | 450,003,173 | (219,508,895) |  | 230,494,278 |  |  |  |  |  |  |

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