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Stockholders' Equity - Narrative (Details)
12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Jun. 30, 2019
EUR (€)
Aug. 03, 2018
USD ($)
May 31, 2015
EUR (€)
Feb. 13, 2015
USD ($)
May 31, 2014
EUR (€)
Defined Benefit Plan Disclosure [Line Items]                      
Preferred stock, shares authorized (in shares) | shares   300,000                  
Cash dividend declared (in dollars per share) | $ / shares   $ 4.14 $ 3.56 $ 2.86              
Cash dividend paid (in dollars per share) | $ / shares   $ 4.07 $ 3.34 $ 2.73              
Tax cuts and jobs act, reclassification from aoci to retained earnings, tax effect $ 45,000,000 $ 0 $ 45,000,000 $ 0              
After-tax cumulative translation adjustment losses included in accumulated comprehensive income (loss)   (1,300,000,000) (1,300,000,000)                
After-tax unrecognized pension and other postretirement benefits costs included in accumulated comprehensive income (loss)   390,000,000 364,000,000                
Estimated pre-tax unrecognized net benefit cost   48,000,000                  
Net Investment Hedging                      
Defined Benefit Plan Disclosure [Line Items]                      
Accumulated other comprehensive income (loss) related to net investment hedge   $ 239,000,000 $ 187,000,000                
Euro Notes, Issued 2014 | Net Investment Hedging | Euro Notes                      
Defined Benefit Plan Disclosure [Line Items]                      
Face value of notes | €                     € 1,000,000,000.0
Euro Notes, Issued 2015 | Net Investment Hedging | Euro Notes                      
Defined Benefit Plan Disclosure [Line Items]                      
Face value of notes | €                 € 1,000,000,000.0    
Euro Notes, Issued 2019 | Net Investment Hedging | Euro Notes                      
Defined Benefit Plan Disclosure [Line Items]                      
Face value of notes | €             € 1,600,000,000        
2015 Stock Repurchase Program                      
Defined Benefit Plan Disclosure [Line Items]                      
Authorized repurchase amount                   $ 6,000,000,000.0  
Shares repurchased (in shares) | shares   3,100,000 13,900,000 7,100,000 18,700,000 6,100,000          
Average price of shares repurchased (in dollars per share) | $ / shares   $ 143.23 $ 143.66 $ 140.56 $ 107.17 $ 91.78          
2018 Stock Repurchase Program                      
Defined Benefit Plan Disclosure [Line Items]                      
Authorized repurchase amount               $ 3,000,000,000.0      
Shares repurchased (in shares) | shares   6,700,000                  
Average price of shares repurchased (in dollars per share) | $ / shares   $ 158.11                  
Authorized repurchases remaining   $ 1,900,000,000