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Income Taxes, Tax Credits and Loss Carryforwards (Details) $ in Millions	Dec. 31, 2020 USD ($)
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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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

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The amount of the tax loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws that is not subject to expiration.

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The amount of the tax loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws that is subject to expiration.

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