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Consolidated Statements of Shareholders' Equity (USD $) In Millions, unless otherwise specified | Total | Common stock: | Additional paid-in capital: | Retained earnings: | Accumulated other comprehensive income (loss): | Treasury stock:
--- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2012 |  | $ 67 | $ 1,505 | $ 17,387 | $ 2,715 | $ (5,696)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options |  |  | 10 |  |  |
Share-based compensation |  |  | 3 |  |  |
Net earnings | 892 |  |  | 892 |  |
Dividends to shareholders |  |  |  | (165) |  |
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  |  |  |  | (474) |
Unrealized gains (losses) on investment securities during period, net of income taxes and reclassification adjustments |  |  |  |  | (589) |
Unrealized gains (losses) on derivatives during period, net of income taxes |  |  |  |  | (4) |
Pension liability adjustment during period, net of income taxes |  |  |  |  | 3 |
Purchases of treasury stock |  |  |  |  |  | (156)
Treasury stock reissued |  |  | 14 |  |  | 23
Balance, end of period at Mar. 31, 2013 | 15,535 | 67 | 1,532 | 18,114 | 1,651 | (5,829)
Balance, beginning of period at Dec. 31, 2013 | 14,620 | 67 | 1,644 | 19,885 | (563) | (6,413)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options |  |  | 6 |  |  |
Share-based compensation |  |  | 5 |  |  |
Net earnings | 732 |  |  | 732 |  |
Dividends to shareholders |  |  |  | (170) |  |
Unrealized foreign currency translation gains (losses) during period, net of income taxes |  |  |  |  | (37) |
Unrealized gains (losses) on investment securities during period, net of income taxes and reclassification adjustments |  |  |  |  | 909 |
Unrealized gains (losses) on derivatives during period, net of income taxes |  |  |  |  | (1) |
Pension liability adjustment during period, net of income taxes |  |  |  |  | (1) |
Purchases of treasury stock |  |  |  |  |  | (421)
Treasury stock reissued |  |  | 12 |  |  | 22
Balance, end of period at Mar. 31, 2014 | $ 15,676 | $ 67 | $ 1,667 | $ 20,447 | $ 307 | $ (6,812)

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