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Capital Stock and Earnings Per Share - Narrative (Details)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 29, 2018
USD ($)
day
$ / shares
shares
Dec. 31, 2018
USD ($)
vote
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Jul. 01, 2021
shares
Jan. 29, 2019
$ / shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Common stock authorized (in shares)   2,000,000,000 2,000,000,000    
Common stock authorized (in dollars per shares) | $ / shares   $ 0.01 $ 0.01    
Preferred stock authorized (in shares)   15,000,000 15,000,000    
Preferred stock authorized (in dollars per shares) | $ / shares $ 0.01 $ 0.01 $ 0.01    
Number of votes per share | vote   1      
Preferred stock issued (in shares) 1,380,000 1,400,000 0    
Preferred stock rate 5.00% 5.00% 5.00%    
Liquidation preference on preferred stock (in dollars per share) | $ / shares $ 1,000 $ 1,000,000      
Proceeds from issuance of MCPS | $ $ 1,340        
Payments of stock issuance costs | $   $ 43      
MCPS excluded from diluted EPS calculation (in shares)   18,400,000      
Mandatory Convertible Preferred Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Payments of stock issuance costs | $ $ 43        
Trading day period for conversion of preferred stock | day 20        
Annual liquidation preference per share (in dollars per share) | $ / shares   $ 50.00      
Mandatory Convertible Preferred Stock | Minimum | Scenario, Forecast          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Preferred stock conversion rate       10.9041  
Mandatory Convertible Preferred Stock | Maximum | Scenario, Forecast          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Preferred stock conversion rate       13.3575  
Over-Allotment Option          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Preferred stock issued (in shares) 180,000        
Subsequent Event          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Dividends declared (in dollars per share) | $ / shares         $ 0.07
Subsequent Event | Mandatory Convertible Preferred Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Dividends declared (in dollars per share) | $ / shares         $ 12.50