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Equity Common Stock Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Oct. 06, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Common Stock, Dividends, Per Share, Cash Paid   $ 0.12 $ 0.12 $ 0.12      
Common Stock, Dividends, Per Share, Declared   $ 0.12     $ 0.11 $ 0.24 $ 0.22
Noncontrolling Interest, Increase from Sale of Parent Equity Interest           $ (69) $ (17)
Scenario, Forecast [Member]              
Common Stock, Dividends, Per Share, Declared $ 0.12