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Income Taxes, Tax Credits and Loss Carryforwards (Details)
$ in Millions
Dec. 31, 2021
USD ($)
U.S. State [Member]  
Operating Loss Carryforwards  
Income tax NOLs (gross amount), subject to expiration $ 12,394
Income tax NOLs (gross amount), unlimited 465
U.S. State [Member] | U S State Income Tax Credits (Gross Amount) Limited [Member]  
Operating Loss Carryforwards  
Income tax credits 80
U.S. State [Member] | U S State Income Tax Credits (Gross Amount) Unlimited [Member]  
Operating Loss Carryforwards  
Income tax credits 21
Foreign [Member]  
Operating Loss Carryforwards  
Income tax credits 598
Income tax NOLs (gross amount), subject to expiration 38
Income tax NOLs (gross amount), unlimited $ 59