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Income Taxes, Tax Credits and Loss Carryforwards (Details) $ in Millions | Dec. 31, 2020 USD ($)
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U.S. State [Member] |
Operating Loss Carryforwards |
Income tax NOLs (gross amount), subject to expiration | $ 12,333
Income tax NOLs (gross amount), unlimited | 34
U.S. State [Member] | U S State Income Tax Credits (Gross Amount) Limited [Member] |
Operating Loss Carryforwards |
Income tax credits | 86
U.S. State [Member] | U S State Income Tax Credits (Gross Amount) Unlimited [Member] |
Operating Loss Carryforwards |
Income tax credits | 17
International [Member] |
Operating Loss Carryforwards |
Income tax credits | 598
Income tax NOLs (gross amount), subject to expiration | 20
Income tax NOLs (gross amount), unlimited | $ 120

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