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Income Taxes (Narrative) (Details)
$ in Millions, ₨ in Billions
 3 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2023
INR (₨)
Apr. 30, 2018
INR (₨)
Mar. 31, 2018
INR (₨)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                  
Income Tax Expense (Benefit)   $ 713 $ 668 $ 730          
Deposits Assets   403 60            
Additions for tax positions of prior years   65 22 65          
Recognition of previously unrecognized income tax benefits related to uncertain tax positions   (15) (33) (43)          
Accrued interest and penalties   35 33            
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations   (15) (15) $ (43)          
Specific uncertain tax position that was previously unrecognized in our prior year consolidated financial statements [Member]                  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                  
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations $ (36)                
Long-term investments [Member]                  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                  
Restricted Investments   0 355            
Foreign Tax Jurisdiction                  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                  
Net operating loss carryforward   131              
Domestic Tax Jurisdiction                  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                  
Net operating loss carryforward   83              
2013 India Share Repurchase [Member] | Ministry of Finance, India [Member] | Foreign Tax Jurisdiction                  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                  
Foreign Earnings Repatriated           $ 523      
2016 India Cash Remittance [Member] | Ministry of Finance, India [Member] | Foreign Tax Jurisdiction                  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                  
Income Tax Expense (Benefit)         $ 135        
Foreign Earnings Repatriated         $ 2,800        
Income Tax, Disputed Amount   $ 386             ₨ 33
Deposits Assets | ₨               ₨ 5  
Deposits Assets, Percent Disputed Tax Amount               15.00%  
Restricted Investments     355            
2016 India Cash Remittance [Member] | Ministry of Finance, India [Member] | Foreign Tax Jurisdiction | Long-term investments [Member]                  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]                  
Restricted Investments     $ 355       ₨ 30