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Shareholders' Equity And Net Income Per Share Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Nov. 22, 2017
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dividends Payable [Line Items]                        
Payments of Cash Dividends     $ 58 $ 58 $ 58 $ 59 $ 77 $ 77 $ 78 $ 78 $ 233 $ 310
Common Stock, Dividends, Per Share, Cash Paid     $ 0.22 $ 0.22 $ 0.22 $ 0.22 $ 0.29 $ 0.29 $ 0.29 $ 0.29 $ 0.88 $ 1.16
Record Date Nov. 22, 2017                      
Subsequent Event [Member]                        
Dividends Payable [Line Items]                        
Cash dividends declared per share   $ 0.22