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FINANCIAL INSTRUMENTS - Debt Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2020
May 02, 2013
Oct. 16, 2009
Jan. 31, 2013
Sep. 30, 2008
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 30, 2019
Jun. 30, 2012
Apr. 03, 2012
Sep. 30, 2009
Disclosure of detailed information about borrowings [line items]                              
Borrowings           $ 5,155 $ 5,536 $ 5,738              
Repayments           353 281                
5.7% notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings, interest rate (as percent)                         5.70%    
Borrowings           842 842 842              
Repayments           $ 0 $ 0                
Effective rate (as percent)           5.73% 5.74%                
3.85%/5.25% Notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings, interest rate (as percent)           385.00%                  
Borrowings           $ 744 $ 1,079 1,079              
Repayments           $ 337 $ 0                
Effective rate (as percent)           5.31% 4.87%                
3.85% Notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings, interest rate (as percent) 3.85%                         3.85%  
Repayments $ 337                 $ 913          
5.25% Notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings, interest rate (as percent)                           5.25%  
Other fixed rate notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings           $ 1,081 $ 1,080 1,326              
Repayments           $ 0 $ 248                
Effective rate (as percent)           6.38% 6.33%                
BPADF Notes Due 2039                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings, interest rate (as percent)     5.95%                        
Borrowings           $ 850 $ 850                
Term of borrowings     30 years                        
BPDAF Notes Due 2019                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings, interest rate (as percent)     4.95%                        
Repayments           $ 248     $ 152            
Term of borrowings     10 years                        
7.50% Notes Due 2038                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings, interest rate (as percent)                             7.50%
Term of borrowings         30 years                    
Credit Facility Due 2025                              
Disclosure of detailed information about borrowings [line items]                              
Basis spread (as percent)                       1.125%      
Commitment fee (as percent)           0.125%                  
Credit Facility Due 2021                              
Disclosure of detailed information about borrowings [line items]                              
Repayments   $ 2,000                          
4.10%/5.75% notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings           $ 843 842 842              
Repayments           0 0                
5.75% Notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings, interest rate (as percent)   5.75%                          
Acacia Credit Facility                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings           0 14 43              
Repayments $ 14         $ 14 $ 29 $ 28 $ 28 $ 29 $ 14        
Term of borrowings       7 years                      
Repayment holiday period       2 years                      
Effective rate (as percent)           0.00% 3.36%                
Gross amount                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings           $ 5,116                  
Gross amount | BNAF Notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings                         $ 4,000    
Gross amount | 5.7% notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings                         $ 850    
Gross amount | 3.85%/5.25% Notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings                           $ 2,000  
Gross amount | 3.85% Notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings                           1,250  
Gross amount | 5.25% Notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings           750               $ 750  
Gross amount | Other fixed rate notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings     $ 1,250                        
Gross amount | BPADF Notes Due 2039                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings     850                        
Gross amount | BPDAF Notes Due 2019                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings     $ 400                        
Gross amount | LLCs Notes Due 2013, Due 2019 and Due 2038                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings                             $ 1,250
Gross amount | 7.50% Notes Due 2038                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings           250                 $ 250
Gross amount | Credit Facility Due 2025                              
Disclosure of detailed information about borrowings [line items]                              
Credit facility available           3,000                  
Gross amount | 4.10%/5.75% notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings   $ 3,000                          
Gross amount | 5.75% Notes                              
Disclosure of detailed information about borrowings [line items]                              
Borrowings   $ 850       $ 850                  
Gross amount | Acacia Credit Facility                              
Disclosure of detailed information about borrowings [line items]                              
Credit facility available       $ 142                      
Acacia Credit Facility Floating Interest Rate | Acacia Credit Facility                              
Disclosure of detailed information about borrowings [line items]                              
Basis spread (as percent)       2.50%