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Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 25, 2021
Nov. 19, 2020
Aug. 20, 2020
May 20, 2020
Feb. 27, 2020
Nov. 21, 2019
Aug. 22, 2019
May 23, 2019
Mar. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]                        
Dividend per share (in dollars per share)   $ 0.250 $ 0.250 $ 0.250 $ 0.250 $ 0.250 $ 0.250 $ 0.250 $ 0.250 $ 1.00 $ 1.00 $ 2.16
Total amount declared   $ 274 $ 274 $ 274 $ 274 $ 273 $ 273 $ 274 $ 273      
Subsequent Event                        
Subsequent Event [Line Items]                        
Dividend per share (in dollars per share) $ 0.25