| Shares outstanding | ||||||
| December 31, | ||||||
| (in millions, except shares) | 2013 | 2012 | 2011 | |||
| Allocated shares (common) | 137,354,139 | 136,821,035 | 131,046,406 | |||
| Unreleased shares (preferred) | 1,105,664 | 910,934 | 858,759 | |||
| Fair value of unreleased ESOP preferred shares | $ | 1,105 | 911 | 859 | ||
| Dividends paid | ||||||
| Year ended December 31, | ||||||
| 2013 | 2012 | 2011 | ||||
| Allocated shares (common) | $ | 159 | 117 | 60 | ||
| Unreleased shares (preferred) | 132 | 115 | 95 | |||