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Consolidated Statements of Income (Parenthetical) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consolidated Statements of Income [Abstract]                      
Earnings allocated to participating share awards $ 6,000,000 $ 9,000,000 $ 17,000,000 $ 11,000,000 $ 6,000,000 $ 10,000,000 $ 11,000,000 $ 11,000,000 $ 43,000,000 $ 38,000,000 $ 46,000,000
Dividends Preferred Stock $ 19,000,000 $ 21,000,000 $ 19,000,000 $ 21,000,000 $ 20,000,000 $ 22,000,000 $ 20,000,000 $ 0 $ 80,000,000 $ 62,000,000 $ 0