XML 76 R90.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Stockholders' Equity (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
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. 01, 2019
Jan. 01, 2018
Jul. 25, 2017
Equity, Class of Treasury Stock [Line Items]                            
Dividends paid, per share (USD per share) $ 1.20 $ 1.20 $ 1.20 $ 1.15 $ 1.15 $ 1.15 $ 1.15 $ 1.10 $ 4.75 $ 4.55 $ 4.30      
Stock repurchased during period, value                 $ 110,000,000 $ 1,160,000,000 $ 682,000,000      
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)                 1,043,121          
Stock repurchased during period, value                 $ 148,000,000          
Stock repurchase program, remaining authorized repurchase amount $ 652,000,000               $ 652,000,000          
Adjustment to beginning retained earnings                            
Equity, Class of Treasury Stock [Line Items]                            
Cumulative effect of new accounting principle in period of adoption                       $ 61,000,000 $ 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                       $ 61,000,000 $ 72,000,000