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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | 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] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment | Total Stockholders' Equity [Member] | Total Stockholders' Equity [Member] Cumulative Effect, Period of Adoption, Adjustment | Total Stockholders' Equity [Member] Open Market Repurchases [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance, Value at Dec. 31, 2019 | $ 3,349 | $ (620) |  | $ 4 | $ (3,439) |  |  |  | $ 3,198 | $ (91) | $ 3,664 | $ (620) | $ 3,336 | $ (620) |  | $ 13
Beginning Balance, Shares at Dec. 31, 2019 |  |  |  | 451,094,879 | (235,658,196) |  | 215,436,683 |  |  |  |  |  |  |  |  |
Accounting Standards Update Extensible List |  | ASU 2016-13 [Member] |  |  |  |  |  |  |  |  |  | ASU 2016-13 [Member] |  | ASU 2016-13 [Member] |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 19 |  |  |  |  |  |  |  |  |  | 19 |  | 19 |  |  |
Other comprehensive income (loss), net of tax | (226) |  |  |  |  |  |  |  |  | (226) |  |  | (226) |  |  |
Total comprehensive income (loss) | (207) |  |  |  |  |  |  |  |  |  |  |  | (207) |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock | (62) |  |  |  |  |  |  |  |  |  | (62) |  | (62) |  |  |
Dividend equivalent units related to employee stock-based compensation plans | (2) |  |  |  |  |  |  |  |  |  | (2) |  | (2) |  |  |
Issuance of common shares | $ 6 |  |  |  |  |  |  |  | 6 |  |  |  | 6 |  |  |
Issuance of common shares, Shares | 2,400,000 |  |  | 2,362,243 |  |  | 2,362,243 |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 11 |  |  |  |  |  |  |  | 11 |  |  |  | 11 |  |  |
Common stock repurchased |  |  | $ (335) |  |  | $ (335) | $ (335) |  |  |  |  |  |  |  | $ (335) |
Common stock repurchased, Shares |  |  |  |  |  | (22,975,880) | (23,000,000.0) | (22,975,880) |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | $ (12) |  |  |  | $ (12) |  |  |  |  |  |  |  | (12) |  |  |
Shares repurchased related to employee stock-based compensation plans, Shares | (900,000) |  |  |  | (904,402) |  | (904,402) |  |  |  |  |  |  |  |  |
Net activity in noncontrolling interest | $ (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2)
Ending Balance, Value at Jun. 30, 2020 | 2,126 |  |  | $ 4 | $ (3,786) |  |  |  | 3,215 | (317) | 2,999 |  | 2,115 |  |  | 11
Ending Balance, Shares at Jun. 30, 2020 |  |  |  | 453,457,122 | (259,538,478) |  | 193,918,644 |  |  |  |  |  |  |  |  |
Beginning Balance, Value at Mar. 31, 2020 | 2,048 |  |  | $ 4 | $ (3,786) |  |  |  | 3,212 | (300) | 2,905 |  | 2,035 |  |  | 13
Beginning Balance, Shares at Mar. 31, 2020 |  |  |  | 453,366,433 | (259,534,353) |  | 193,832,080 |  |  |  |  |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 125 |  |  |  |  |  |  |  |  |  | 125 |  | 125 |  |  |
Other comprehensive income (loss), net of tax | (17) |  |  |  |  |  |  |  |  | (17) |  |  | (17) |  |  |
Total comprehensive income (loss) | 108 |  |  |  |  |  |  |  |  |  |  |  | 108 |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock | (31) |  |  |  |  |  |  |  |  |  | (31) |  | (31) |  |  |
Issuance of common shares | $ 1 |  |  |  |  |  |  |  | 1 |  |  |  | 1 |  |  |
Issuance of common shares, Shares | 100,000 |  |  | 90,689 |  |  | 90,689 |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 2 |  |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |
Shares repurchased related to employee stock-based compensation plans, Shares |  |  |  |  | (4,125) |  | (4,125) |  |  |  |  |  |  |  |  |
Net activity in noncontrolling interest | (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2)
Ending Balance, Value at Jun. 30, 2020 | 2,126 |  |  | $ 4 | $ (3,786) |  |  |  | 3,215 | (317) | 2,999 |  | 2,115 |  |  | 11
Ending Balance, Shares at Jun. 30, 2020 |  |  |  | 453,457,122 | (259,538,478) |  | 193,918,644 |  |  |  |  |  |  |  |  |
Beginning Balance, Value at Dec. 31, 2020 | 2,447 |  |  | $ 4 | $ (3,854) |  |  |  | 3,226 | (274) | 3,331 |  | 2,433 |  |  | 14
Beginning Balance, Shares at Dec. 31, 2020 |  |  |  | 453,778,975 | (267,476,521) |  | 186,302,454 |  |  |  |  |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 555 |  |  |  |  |  |  |  |  |  | 555 |  | 555 |  |  |
Other comprehensive income (loss), net of tax | 65 |  |  |  |  |  |  |  |  | 65 |  |  | 65 |  |  |
Total comprehensive income (loss) | 620 |  |  |  |  |  |  |  |  |  |  |  | 620 |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock | (56) |  |  |  |  |  |  |  |  |  | (56) |  | (56) |  |  |
Dividend equivalent units related to employee stock-based compensation plans | (2) |  |  |  |  |  |  |  |  |  | (2) |  | (2) |  |  |
Issuance of common shares | $ 29 |  |  |  |  |  |  |  | 29 |  |  |  | 29 |  |  |
Issuance of common shares, Shares | 4,300,000 |  |  | 4,265,712 |  |  | 4,265,712 |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 13 |  |  |  |  |  |  |  | 13 |  |  |  | 13 |  |  |
Common stock repurchased |  |  | (300) |  |  | $ (300) | $ (300) |  |  |  |  |  |  |  | (300) |
Common stock repurchased, Shares |  |  |  |  |  | (19,932,740) | (19,900,000) | (19,932,740) |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | $ (36) |  |  |  | $ (36) |  |  |  |  |  |  |  | (36) |  |  |
Shares repurchased related to employee stock-based compensation plans, Shares | (2,800,000) |  |  |  | (2,795,238) |  | (2,795,238) |  |  |  |  |  |  |  |  |
Net activity in noncontrolling interest | $ (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3)
Ending Balance, Value at Jun. 30, 2021 | 2,712 |  |  | $ 4 | $ (4,190) |  |  |  | 3,268 | (209) | 3,828 |  | 2,701 |  |  | 11
Ending Balance, Shares at Jun. 30, 2021 |  |  |  | 458,044,687 | (290,204,499) |  | 167,840,188 |  |  |  |  |  |  |  |  |
Beginning Balance, Value at Mar. 31, 2021 | 2,737 |  |  | $ 4 | $ (3,980) |  |  |  | 3,255 | (226) | 3,670 |  | 2,723 |  |  | 14
Beginning Balance, Shares at Mar. 31, 2021 |  |  |  | 457,403,561 | (277,890,279) |  | 179,513,282 |  |  |  |  |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 185 |  |  |  |  |  |  |  |  |  | 185 |  | 185 |  |  |
Other comprehensive income (loss), net of tax | 17 |  |  |  |  |  |  |  |  | 17 |  |  | 17 |  |  |
Total comprehensive income (loss) | 202 |  |  |  |  |  |  |  |  |  |  |  | 202 |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock | (27) |  |  |  |  |  |  |  |  |  | (27) |  | (27) |  |  |
Issuance of common shares | $ 10 |  |  |  |  |  |  |  | 10 |  |  |  | 10 |  |  |
Issuance of common shares, Shares | 600,000 |  |  | 641,126 |  |  | 641,126 |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 3 |  |  |  |  |  |  |  | 3 |  |  |  | 3 |  |  |
Common stock repurchased |  |  | $ (200) |  |  | $ (200) | $ (200) |  |  |  |  |  |  |  | $ (200) |
Common stock repurchased, Shares |  |  |  |  |  | (11,754,640) | (11,800,000) | (11,754,640) |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | $ (10) |  |  |  | $ (10) |  |  |  |  |  |  |  | (10) |  |  |
Shares repurchased related to employee stock-based compensation plans, Shares | (600,000) |  |  |  | (559,580) |  | (559,580) |  |  |  |  |  |  |  |  |
Net activity in noncontrolling interest | $ (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3)
Ending Balance, Value at Jun. 30, 2021 | $ 2,712 |  |  | $ 4 | $ (4,190) |  |  |  | $ 3,268 | $ (209) | $ 3,828 |  | $ 2,701 |  |  | $ 11
Ending Balance, Shares at Jun. 30, 2021 |  |  |  | 458,044,687 | (290,204,499) |  | 167,840,188 |  |  |  |  |  |  |  |  |

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