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Capital Stock (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 12 Months Ended
Mar. 27, 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
Jan. 28, 2020
Dec. 07, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                            
Share-based compensation expense                   $ 294,000,000 $ 226,000,000 $ 170,000,000    
Tax benefit from share-based compensation expense                   78,000,000 61,000,000 68,000,000    
Cash received from exercise of stock options                   $ 187,000,000 173,000,000 225,000,000    
Employee stock purchase plan, purchase price per share as a percent of closing price                   90.00%        
Increase in stock repurchase program authorization                           $ 5,000,000,000
Dividends Payable, Date to be Paid   Dec. 20, 2019 Sep. 25, 2019 Jun. 25, 2019 Mar. 29, 2019 Dec. 21, 2018 Sep. 25, 2018 Jun. 25, 2018 Mar. 23, 2018          
Dividends Payable, Date of Record   Dec. 05, 2019 Sep. 10, 2019 Jun. 10, 2019 Mar. 18, 2019 Dec. 05, 2018 Sep. 10, 2018 Jun. 08, 2018 Mar. 09, 2018          
Incentive Compensation Plan [Member]                            
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                            
Number of registered shares for issuance   37.5               37.5        
Number of shares available for future issuance   20.5               20.5        
Restricted Stock Units (RSUs) [Member]                            
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                            
Fair value of shares vested                   $ 245,000,000 237,000,000 127,000,000    
Unrecognized compensation cost   $ 139,000,000               $ 139,000,000        
Weighted-average remaining requisite service period                   12 months        
Stock Option [Member]                            
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                            
Stock incentive plan vesting period, years                   3 years        
Stock option term, years                   10 years        
Intrinsic value of options exercised                   $ 188,000,000 172,000,000 192,000,000    
Tax benefit from stock option exercises and disqualifying dispositions                   52,000,000 47,000,000 76,000,000    
Cash received from exercise of stock options                   143,000,000 $ 141,000,000 $ 200,000,000    
Unrecognized compensation cost   $ 25,000,000               $ 25,000,000        
Weighted-average remaining requisite service period                   11 months        
Subsequent Event [Member]                            
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                            
Dividends Payable, Amount Per Share                         $ 0.95  
Dividends Payable, Date to be Paid Mar. 27, 2020                          
Dividends Payable, Date of Record Mar. 16, 2020                          
Employee Stock Purchase Plan [Member]                            
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                            
Number of registered shares for issuance   14.0               14.0        
Number of shares available for future issuance   4.9               4.9        
Maximum amount of stock employees are permitted to purchase per calender year (whole dollars)                   $ 25,000        
Payroll deductions, percent of gross compensation, minimum   1.00%               1.00%        
Payroll deductions, percent of gross compensation, maximum   15.00%               15.00%        
Employee stock purchase plan, purchase price per share as a percent of closing price                   90.00%        
Stock Issued During Period, Shares                   0.2        
Restricted Stock Units (RSUs) [Member] | 2019 to 2021 [Member]                            
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                            
Approximate number of performance restricted stock units granted                   0.2