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Debt (Recourse Debt Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]                    
Borrowings under the revolving credit facilities           $ 2,802 $ 2,420 $ 2,026    
Repayments of Lines of Credit           2,420 2,479 1,735    
Gain (Loss) on Extinguishment of Debt           (78) (186) (169)    
Recourse Debt Total   $ 3,447     $ 3,447 $ 3,754 3,447      
Senior Notes [Member] | Corporate and Other | Secured Debt [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate 2.45%                  
Senior Notes [Member] | Revolving Credit Facility due 2026 | Corporate and Other                    
Debt Instrument [Line Items]                    
Debt face amount $ 1,250                  
Senior Notes [Member] | Revolving Credit Facility due 2024 | Corporate and Other                    
Debt Instrument [Line Items]                    
Debt face amount                 $ 1,000  
Senior Notes [Member] | 1.375% Senior Notes Due 2026 | Corporate and Other                    
Debt Instrument [Line Items]                    
Debt Conversion, Converted Instrument, Amount $ 798                  
Senior Notes [Member] | 1.375% Senior Notes Due 2026 | Corporate and Other | Secured Debt [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate 1.375%                  
Debt face amount $ 800                  
Senior Notes [Member] | 1.375% Senior Notes Due 2026 | Corporate and Other | Unsecured Debt [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate                 1.375%  
Debt face amount                 $ 800  
Senior Notes [Member] | 2.45% Senior Notes Due 2031 | Corporate and Other                    
Debt Instrument [Line Items]                    
Debt Conversion, Converted Instrument, Amount 997                  
Senior Notes [Member] | 2.45% Senior Notes Due 2031 | Corporate and Other | Secured Debt [Member]                    
Debt Instrument [Line Items]                    
Debt face amount $ 1,000                  
Senior Notes [Member] | 2.45% Senior Notes Due 2031 | Corporate and Other | Unsecured Debt [Member]                    
Debt Instrument [Line Items]                    
Stated interest rate                 2.45%  
Debt face amount                 $ 1,000  
Recourse Debt                    
Debt Instrument [Line Items]                    
Percentage of capital stock of foreign subsidiaries securing obligations           65.00%        
Maximum ratio of debt to cash flow           5.75        
Parent Company [Member]                    
Debt Instrument [Line Items]                    
Borrowings under the revolving credit facilities       $ 840            
Repayments of Lines of Credit         1,500          
Gain (Loss) on Extinguishment of Debt           $ 0 (146) $ (5)    
Recourse Debt Total           3,729        
Parent Company [Member] | COVID-19 Liquidity [Member]                    
Debt Instrument [Line Items]                    
Borrowings under the revolving credit facilities       250            
Repayments of Lines of Credit     $ 250              
Parent Company [Member] | Other General Corporate Purposes [Member]                    
Debt Instrument [Line Items]                    
Borrowings under the revolving credit facilities       $ 590            
Parent Company [Member] | Recourse Debt                    
Debt Instrument [Line Items]                    
Borrowings under the revolving credit facilities         755          
Gain (Loss) on Extinguishment of Debt   (108) (37)              
Parent Company [Member] | Recourse Debt | Revolving Credit Facility [Member] | Revolving Facility 2026                    
Debt Instrument [Line Items]                    
Recourse Debt Total   70     70 $ 365 70      
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%        
Recourse Debt Total   900     900 $ 900 900      
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%            
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%            
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%        
Recourse Debt Total   700     700 $ 700 700      
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%
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% 1.375%      
Recourse Debt Total   $ 800     $ 800 $ 800 $ 800      
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% 2.45%      
Recourse Debt Total   $ 1,000     $ 1,000 $ 1,000 $ 1,000      
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%
Parent Company [Member] | Recourse Debt | 6.00% senior notes due 2026 [Domain]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Effective Percentage                   6.00%
Parent Company [Member] | Recourse Debt | 5.125% Senior Notes Due 2027 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Effective Percentage                   5.125%
Parent Company [Member] | Recourse Debt | Revolving Credit Facility due 2026 | Revolving Facility 2026                    
Debt Instrument [Line Items]                    
Recourse Debt Total           $ 365        
Parent Company [Member] | Recourse Debt | 5.50% Senior Unsecured Note Due 2024                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Effective Percentage                   5.50%