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Stockholders' Equity (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Jul. 25, 2017
Equity, Class of Treasury Stock [Line Items]                          
Dividends paid, per share (USD per share) $ 1.15 $ 1.15 $ 1.15 $ 1.10 $ 1.10 $ 1.10 $ 1.10 $ 1.00 $ 4.55 $ 4.3 $ 3.9    
Stock repurchased during period, value                 $ 1,160,000,000 $ 682,000,000 $ 506,000,000    
Common Stock | Share Repurchase Program 2017                          
Equity, Class of Treasury Stock [Line Items]                          
Stock repurchase program, authorized amount                         $ 2,000,000,000
Stock repurchased during period, shares (in shares)                 7,456,038        
Stock repurchased during period, value                 $ 1,200,000,000        
Stock repurchase program, remaining authorized repurchase amount $ 800,000,000               $ 800,000,000        
Adjustment to beginning retained earnings                          
Equity, Class of Treasury Stock [Line Items]                          
Cumulative effect of new accounting principle in period of adoption                       $ 72,000,000  
Adjustment to beginning retained earnings | Retained Earnings                          
Equity, Class of Treasury Stock [Line Items]                          
Cumulative effect of new accounting principle in period of adoption                       72,000,000  
Accounting Standards Update 2016-16 | Retained Earnings                          
Equity, Class of Treasury Stock [Line Items]                          
Cumulative effect of new accounting principle in period of adoption                       56,000,000  
Accounting Standards Update 2016-01 | Retained Earnings                          
Equity, Class of Treasury Stock [Line Items]                          
Cumulative effect of new accounting principle in period of adoption                       17,000,000  
Accounting Standards Update 2014-09 | Retained Earnings                          
Equity, Class of Treasury Stock [Line Items]                          
Cumulative effect of new accounting principle in period of adoption                       $ 400,000