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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
May 14, 2020
May 31, 2020
Apr. 03, 2020
Mar. 29, 2019
Mar. 30, 2018
Feb. 04, 2020
Jan. 31, 2020
Nov. 11, 2019
Subsequent Event [Line Items]                
Cash dividends declared per common share (in usd per share)     $ 12.40 $ 0.30 $ 0.30      
Payment for debt extinguishment     $ 546 $ 0 $ 0      
Common Stock | Subsequent Event                
Subsequent Event [Line Items]                
Cash dividends declared per common share (in usd per share) $ 0.125              
Convertible Debt | 2.0% Convertible Senior Notes due August 15, 2022                
Subsequent Event [Line Items]                
Stated interest rate (as a percent)     2.00%     2.00%   2.00%
Conversion price (in usd per share)           $ 10.23 $ 10.23  
Convertible Debt | 2.0% Convertible Senior Notes due August 15, 2022 | Subsequent Event                
Subsequent Event [Line Items]                
Stated interest rate (as a percent)   2.00%            
Payment for debt extinguishment   $ 1,180            
Conversion price (in usd per share)   $ 19.25