Tax Matters - Deferred Taxes - Footnotes (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Income Tax Examination [Line Items]
Reduction for unrecognized tax benefit		$ 3,000	$ 3,000
Net deferred tax liability	[1],[2]		3,123
Noncurrent Deferred Tax Assets And Other Noncurrent Tax Assets [Member]
Income Tax Examination [Line Items]
Net deferred tax liability		1,600	900
Noncurrent Deferred Tax Liabilities [Member]
Income Tax Examination [Line Items]
Net deferred tax liability		$ 300	$ 4,100

[1] In 2021, Noncurrent deferred tax assets and other noncurrent tax assets ($1.6 billion), and Noncurrent deferred tax liabilities ($0.3 billion). In 2020, Noncurrent deferred tax assets and other noncurrent tax assets ($0.9 billion), and Noncurrent deferred tax liabilities ($4.1 billion).

[2] The deferred tax assets and liabilities associated with global intangible low-taxed income are included in the relevant categories. See Note 1Q.