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Debt (Recourse Debt Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                
Proceeds from Lines of Credit           $ 2,420 $ 2,026 $ 1,865
Repayments of Lines of Credit           2,479 1,735 2,238
Gain (Loss) on Extinguishment of Debt           (186) (169) (188)
Recourse Debt Total $ 3,447     $ 3,447   $ 3,447 3,396  
LIBOR 1.75% Term Loan Due In 2022 [Member]                
Debt Instrument [Line Items]                
Debt terminated amount         $ 343      
4.875% Senior Notes Due 2023 [Member] [Member]                
Debt Instrument [Line Items]                
Debt terminated amount         $ 100      
Senior Notes [Member] | 4.875% Senior Notes Due 2023 [Member] [Member]                
Debt Instrument [Line Items]                
Stated interest rate         4.875%      
Recourse Debt                
Debt Instrument [Line Items]                
Percentage of capital stock of foreign subsidiaries securing obligations 65.00%     65.00%   65.00%    
Maximum ratio of debt to cash flow 5.75     5.75   5.75    
Minimum ratio of operating cash flow to interest charges 2.5     2.5   2.5    
Recourse Debt | LIBOR | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate         1.75% 1.75%    
Unsecured Debt [Member] | Recourse Debt | 4.875% Senior Notes Due 2023 [Member] [Member]                
Debt Instrument [Line Items]                
Gain (Loss) on Extinguishment of Debt         $ 5      
Parent Company [Member]                
Debt Instrument [Line Items]                
Proceeds from Lines of Credit     $ 840          
Repayments of Lines of Credit       $ 1,500        
Gain (Loss) on Extinguishment of Debt           $ (146) (5) $ (171)
Recourse Debt Total $ 3,430     3,430   $ 3,430    
Parent Company [Member] | COVID-19 Liquidity [Member]                
Debt Instrument [Line Items]                
Proceeds from Lines of Credit     250          
Repayments of Lines of Credit   $ 250            
Parent Company [Member] | Other General Corporate Purposes [Member]                
Debt Instrument [Line Items]                
Proceeds from Lines of Credit     $ 590          
Parent Company [Member] | Recourse Debt                
Debt Instrument [Line Items]                
Proceeds from Lines of Credit       $ 755        
Gain (Loss) on Extinguishment of Debt $ (108) (37)            
Parent Company [Member] | Recourse Debt | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage 1.86%     1.86%   1.86%    
Recourse Debt Total $ 70     $ 70   $ 70 180  
Parent Company [Member] | Recourse Debt | 3.30% Senior Notes Due 2025                
Debt Instrument [Line Items]                
Debt face amount   900            
Debt Instrument, Interest Rate, Effective Percentage 3.30%     3.30%   3.30%    
Recourse Debt Total $ 900     $ 900   $ 900 0  
Parent Company [Member] | Recourse Debt | 4.0% Senior Notes Due 2021 [Domain] [Domain]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage 4.00%     4.00%   4.00%    
Recourse Debt Total $ 0     $ 0   $ 0 500  
Parent Company [Member] | Recourse Debt | 4.875% Senior Notes Due 2023 [Member] [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage 4.875%     4.875%   4.875%    
Recourse Debt Total $ 0     $ 0   $ 0 613  
Parent Company [Member] | Recourse Debt | 3.95% Senior Notes Due 2030                
Debt Instrument [Line Items]                
Debt face amount   700            
Debt Instrument, Interest Rate, Effective Percentage 3.95%     3.95%   3.95%    
Recourse Debt Total $ 700     $ 700   $ 700 0  
Parent Company [Member] | Recourse Debt | 4.5% Senior Notes Due 2023 [Domain] [Domain]                
Debt Instrument [Line Items]                
Debt terminated amount   $ 7            
Debt Instrument, Interest Rate, Effective Percentage 4.50%     4.50%   4.50%    
Recourse Debt Total $ 0     $ 0   $ 0 500  
Parent Company [Member] | Recourse Debt | 1.375% Senior Notes Due 2026                
Debt Instrument [Line Items]                
Debt face amount $ 800     $ 800   $ 800    
Debt Instrument, Interest Rate, Effective Percentage 1.375%     1.375%   1.375%    
Recourse Debt Total $ 800     $ 800   $ 800 0  
Parent Company [Member] | Recourse Debt | 2.45% Senior Notes Due 2031                
Debt Instrument [Line Items]                
Debt face amount $ 1,000     $ 1,000   $ 1,000    
Debt Instrument, Interest Rate, Effective Percentage 2.45%     2.45%   2.45%    
Recourse Debt Total $ 1,000     $ 1,000   $ 1,000 0  
Parent Company [Member] | Recourse Debt | 5.50% Unsecured senior notes due 2025 [Domain]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage 5.50%     5.50%   5.50%    
Recourse Debt Total $ 0     $ 0   $ 0 544  
Parent Company [Member] | Recourse Debt | 6.00% senior notes due 2026 [Domain]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage 6.00%     6.00%   6.00%    
Recourse Debt Total $ 0     $ 0   $ 0 500  
Parent Company [Member] | Recourse Debt | 5.125% Senior Notes Due 2027 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage 5.125%     5.125%   5.125%    
Recourse Debt Total $ 0     $ 0   $ 0 500  
Parent Company [Member] | Recourse Debt | 5.50% Senior Unsecured Note Due 2024                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Effective Percentage 5.50%     5.50%   5.50%    
Recourse Debt Total $ 0     $ 0   $ 0 $ 63