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Income Taxes (Unaudited) Unrecognized Tax Benefit (Details 2) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Unrecognized Tax Benefit Detail      
Increase in Unrecognized Tax Benefits is Reasonably Possible $ 100    
Unrecognized Tax Benefits, Period Increase (Decrease) 100    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense $ 16   $ 21
Internal Revenue Service (IRS)      
Unrecognized Tax Benefit Detail      
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities   $ 766