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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Millions, unless otherwise specified | Total | Common stock [Member] | Additional paid-in capital [Member] | Retained earnings [Member] | Accumulated other comprehensive income (loss) [Member] | Treasury stock [Member] | Notes receivable for the issuance of common stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 |  | $ 683 | $ 2,141 | $ 8,308 | $ 480 | $ (102) | $ (22)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 250 |  |  | 250 |  |  |
Other comprehensive income (loss) |  |  |  |  | 284 |  |
Dividends paid to common stockholders |  |  |  | (41) |  |  |
Stock-based compensation |  |  | (1) |  |  | 2 |
(Increase) decrease in notes receivable from the issuance of common stock |  |  |  |  |  |  | (1)
Balance at Mar. 31, 2012 | 11,981 | 683 | 2,140 | 8,517 | 764 | (100) | (23)
Balance at Dec. 31, 2012 | 12,314 | 683 | 2,146 | 8,774 | 831 | (99) | (21)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 250 |  |  | 250 |  |  |
Other comprehensive income (loss) |  |  |  |  | (104) |  |
Dividends paid to common stockholders |  |  |  | (55) |  |  |
Stock-based compensation |  |  | (8) |  |  | 7 |
(Increase) decrease in notes receivable from the issuance of common stock |  |  |  |  |  |  | 1
Balance at Mar. 31, 2013 | $ 12,405 | $ 683 | $ 2,138 | $ 8,969 | $ 727 | $ (92) | $ (20)

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