XML 86 R114.htm IDEA: XBRL DOCUMENT v3.20.1
Capital Stock - Summary of Normal Course Issuer Bids (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Share Repurchase Programs [Line Items]    
Shares purchased 25,768,563 32,644,284
Cash amount $ 1,289 $ 1,831
2017 Bid [Member]    
Schedule Of Share Repurchase Programs [Line Items]    
Maximum number of shares 35,800,000  
Shares purchased   26,630,243
Cash amount   $ 1,544
2018 Bid [Member]    
Schedule Of Share Repurchase Programs [Line Items]    
Maximum number of shares 33,200,000  
Shares purchased 23,401,457 6,014,041
Cash amount $ 1,159 $ 287
2019 Bid [Member]    
Schedule Of Share Repurchase Programs [Line Items]    
Maximum number of shares 30,283,500  
Shares purchased 2,367,106  
Cash amount $ 130