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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Feb. 18, 2020
Jan. 13, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]                          
Cash dividends declared per common share     $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.15 $ 0.15 $ 0.13 $ 0.13 $ 0.68 $ 0.56 $ 0.40
Payments to Acquire Businesses, Gross                     $ 177    
Subsequent event                          
Subsequent Event [Line Items]                          
Business Acquisition, Date of Acquisition Agreement Feb. 18, 2020                        
Payments to Acquire Businesses, Gross $ 2,650                        
Business combination, cash consideration to be paid 1,350                        
Equity Issued in Business Combination, Fair Value Disclosure $ 1,300                        
Subsequent event | Common stock                          
Subsequent Event [Line Items]                          
Dividends Payable, Date Declared   Jan. 13, 2020                      
Cash dividends declared per common share   $ 0.19                      
Dividend, increase per common share   $ 0.02                      
Dividends Payable, Date to be Paid   Feb. 14, 2020                      
Dividends Payable, Date of Record   Jan. 31, 2020