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