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Consolidated Statements of Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Consolidated Statements of Income [Abstract]        
Earnings allocated to participating share awards $ 11 $ 12 $ 22 $ 24
Preferred dividends $ 20 $ 0 $ 20 $ 0