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Stockholders' Equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Feb. 04, 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
Dec. 31, 2016
Subsequent Event [Line Items]                        
Document Fiscal Year Focus                   2018    
Common Stock, Dividends, Per Share, Declared   $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 0.52 $ 0.52 $ 0.52 $ 0.52 $ 2.28 $ 2.08 $ 1.84
Dividends, Common Stock, Cash   $ 741 $ 746 $ 747 $ 752 $ 687 $ 685 $ 685 $ 685 $ 2,986 $ 2,742  
Subsequent Event [Member]                        
Subsequent Event [Line Items]                        
Common Stock, Dividends, Per Share, Declared $ 0.63                      
Dividends Payable, Date to be Paid Mar. 28, 2019                      
Dividends Payable, Date of Record Mar. 15, 2019