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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
Feb. 25, 2020
Jun. 14, 2019
Mar. 12, 2019
Mar. 16, 2020
Mar. 16, 2020
Aug. 13, 2019
Aug. 13, 2019
May 21, 2019
May 21, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator:                          
Net Income (Loss)                   $ (320) $ 179 $ (588) $ 221
(Loss) earnings per common share                          
Basic                   271.7 300.3 275.1 303.1
Earnings Per Share, Basic                   $ (1.18) $ 0.60 $ (2.14) $ 0.73
Diluted                          
Employee stock options, restricted stock units and stock purchase plan                   0.0 1.5 0.0 1.5
Adjusted weighted average shares outstanding and assumed conversions for diluted earnings per share                   271.7 301.8 275.1 304.6
Earnings Per Share, Diluted                   $ (1.18) $ 0.59 $ (2.14) $ 0.73
Shares excluded from EPS calculation (in millions):                          
Shares issuable upon exercise of outstanding stock options or vesting of restricted stock units as assumed exercise would be antidilutive                   1.2 0.0 1.6 0.0
Accelerated Share Repurchases, Settlement (Payment) or Receipt $ 160 $ 125 $ 125                    
Treasury Stock, Shares, Acquired 6.6 5.2 6.1 4.9 11.5 6.7 1.5 1.3 7.4        
Accelerated Share Repurchases, Final Price Paid Per Share         $ 13.91 $ 18.58     $ 16.93        
Retained Earnings [Member]                          
Numerator:                          
Net Income (Loss)                   $ (320) $ 179 $ (588) $ 221