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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions | Total | Common shares [Member] | Additional paid-in capital [Member] | Retained earnings [Member] | Treasury shares [Member] | AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjustment Retained earnings [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  | 136,330,747 |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 5,588 | $ 3 | $ 8,260 | $ 12,909 | $ (15,293) | $ (291) |  |
Beginning balance (Premium Amortization on Purchased Callable Debt Securities Guidance [Member]) at Dec. 31, 2018 |  |  |  |  |  |  | $ (5) | $ (5)
Comprehensive income (loss) [Abstract] |  |  |  |  |  |  |  |
Net income | 1,430 |  |  | 1,430 |  |  |  |
Other comprehensive income (loss), net of tax | 628 |  |  |  |  | 628 |  |
Total comprehensive income | 2,058 |  |  |  |  |  |  |
Dividends to shareholders | (390) |  |  | (390) |  |  |  |
Repurchase of common shares (in shares) |  | (10,597,948) |  |  |  |  |  |
Repurchase of common shares | (1,442) |  |  |  | (1,442) |  |  |
Share-based compensation plans (in shares) |  | 1,672,297 |  |  |  |  |  |
Share-based compensation plans | $ 188 |  | 132 |  | 56 |  |  |
Ending balance (in shares) at Sep. 30, 2019 | 127,405,096 | 127,405,096 |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | $ 5,997 | $ 3 | 8,392 | 13,944 | (16,679) | 337 |  |
Beginning balance (in shares) at Jun. 30, 2019 |  | 131,292,759 |  |  |  |  |  |
Beginning balance at Jun. 30, 2019 | 6,030 | $ 3 | 8,337 | 13,530 | (16,109) | 269 |  |
Comprehensive income (loss) [Abstract] |  |  |  |  |  |  |  |
Net income | 543 |  |  | 543 |  |  |  |
Other comprehensive income (loss), net of tax | 68 |  |  |  |  | 68 |  |
Total comprehensive income | 611 |  |  |  |  |  |  |
Dividends to shareholders | (129) |  |  | (129) |  |  |  |
Repurchase of common shares (in shares) |  | (4,145,672) |  |  |  |  |  |
Repurchase of common shares | (570) |  |  |  | (570) |  |  |
Share-based compensation plans (in shares) |  | 258,009 |  |  |  |  |  |
Share-based compensation plans | $ 55 |  | 55 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 | 127,405,096 | 127,405,096 |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | $ 5,997 | $ 3 | 8,392 | 13,944 | (16,679) | 337 |  |
Beginning balance (in shares) at Dec. 31, 2019 |  | 123,939,234 |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 5,729 | $ 3 | 8,461 | 14,279 | (17,276) | 262 |  |
Beginning balance (Current expected credit losses guidance [Member]) at Dec. 31, 2019 |  |  |  |  |  |  | $ (9) | $ (9)
Comprehensive income (loss) [Abstract] |  |  |  |  |  |  |  |
Net income | 1,357 |  |  | 1,357 |  |  |  |
Other comprehensive income (loss), net of tax | 254 |  |  |  |  | 254 |  |
Total comprehensive income | 1,611 |  |  |  |  |  |  |
Dividends to shareholders | (386) |  |  | (386) |  |  |  |
Repurchase of common shares (in shares) |  | (7,392,430) |  |  |  |  |  |
Repurchase of common shares | (1,135) |  |  |  | (1,135) |  |  |
Share-based compensation plans (in shares) |  | 2,084,805 |  |  |  |  |  |
Share-based compensation plans | 257 |  | 216 |  | 41 |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 118,631,609 |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | 6,067 | $ 3 | 8,677 | 15,241 | (18,370) | 516 |  |
Beginning balance (in shares) at Jun. 30, 2020 |  | 120,607,501 |  |  |  |  |  |
Beginning balance at Jun. 30, 2020 | 6,500 | $ 3 | 8,622 | 15,510 | (18,029) | 394 |  |
Comprehensive income (loss) [Abstract] |  |  |  |  |  |  |  |
Net income | (140) |  |  | (140) |  |  |  |
Other comprehensive income (loss), net of tax | 122 |  |  |  |  | 122 |  |
Total comprehensive income | (18) |  |  |  |  |  |  |
Dividends to shareholders | (129) |  |  | (129) |  |  |  |
Repurchase of common shares (in shares) |  | (2,215,753) |  |  |  |  |  |
Repurchase of common shares | (341) |  |  |  | (341) |  |  |
Share-based compensation plans (in shares) |  | 239,861 |  |  |  |  |  |
Share-based compensation plans | 55 |  | 55 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 118,631,609 |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | $ 6,067 | $ 3 | $ 8,677 | $ 15,241 | $ (18,370) | $ 516 |  |

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