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FINANCIAL INSTRUMENTS - Debt Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2020
May 02, 2013
Oct. 16, 2009
Jan. 31, 2013
Sep. 30, 2008
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 30, 2019
Apr. 03, 2012
Jun. 30, 2011
Disclosure of detailed information about borrowings [line items]                          
Borrowings           $ 5,536,000,000 $ 5,738,000,000 $ 6,423,000,000          
Repayments           281,000,000 687,000,000            
BNAF Notes Due 2021                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings, interest rate (as percent)                         4.40%
Repayments             0   $ 721,000,000        
BNAF Notes Due 2041                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings, interest rate (as percent)                         5.70%
Borrowings           $ 850,000,000 850,000,000            
3.85%/5.25% Notes                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings, interest rate (as percent)           385.00%              
Borrowings           $ 1,079,000,000 1,079,000,000 1,079,000,000          
Repayments           $ 0 $ 0            
Effective rate (as percent)           4.87% 4.87%            
3.85% Notes                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings, interest rate (as percent) 3.85%                     3.85%  
Repayments $ 337,000,000                 $ 913,000,000      
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           $ 1,080,000,000 $ 1,326,000,000 1,326,000,000          
Repayments           $ 248,000,000 $ 0            
Effective rate (as percent)           6.33% 6.16%            
BPADF Notes Due 2039                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings, interest rate (as percent)     5.95%                    
Borrowings           $ 850,000,000 $ 850,000,000            
Term of borrowings     30 years                    
BPDAF Notes Due 2019                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings, interest rate (as percent)     4.95%                    
Borrowings           0 248,000,000            
Repayments           $ 248,000,000     152,000,000        
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)                     1.25%    
Commitment fee (as percent)           0.15%              
Credit Facility Due 2021                          
Disclosure of detailed information about borrowings [line items]                          
Repayments   $ 2,000,000,000                      
4.10%/5.75% notes                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings           $ 842,000,000 842,000,000 842,000,000          
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           14,000,000 43,000,000 71,000,000          
Repayments $ 14,000,000         $ 29,000,000 $ 28,000,000 $ 28,000,000 $ 29,000,000 $ 14,000,000      
Term of borrowings       7 years                  
Repayment holiday period       2 years                  
Effective rate (as percent)           3.36% 3.59%            
Gross amount                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings           $ 5,467,000,000              
Gross amount | BNAF Notes                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings                         $ 4,000,000,000
Gross amount | BNAF Notes Due 2021                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings                         1,350,000,000.00
Gross amount | BNAF Notes Due 2041                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings                         $ 850,000,000
Gross amount | 3.85%/5.25% Notes                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings                       $ 2,000,000,000  
Gross amount | 3.85% Notes                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings           337,000,000           1,250,000,000  
Gross amount | 5.25% Notes                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings           750,000,000           $ 750,000,000  
Gross amount | Other fixed rate notes                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings     $ 1,250,000,000                    
Gross amount | BPADF Notes Due 2039                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings     850,000,000                    
Gross amount | BPDAF Notes Due 2019                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings     $ 400,000,000                    
Gross amount | LLCs Notes Due 2013, Due 2019 and Due 2038                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings         $ 1,250,000,000                
Gross amount | 7.50% Notes Due 2038                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings         $ 250,000,000 250,000,000              
Gross amount | Credit Facility Due 2025                          
Disclosure of detailed information about borrowings [line items]                          
Credit facility available                     $ 3,000,000,000    
Gross amount | 4.10%/5.75% notes                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings   $ 3,000,000,000                      
Gross amount | 5.75% Notes                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings   $ 850,000,000       850,000,000              
Gross amount | Acacia Credit Facility                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings           $ 14,000,000              
Credit facility available       $ 142,000,000                  
Acacia Credit Facility Floating Interest Rate | Acacia Credit Facility                          
Disclosure of detailed information about borrowings [line items]                          
Basis spread (as percent)       2.50%