Divestiture - Narrative (Details) - Not Discontinued Operations $ in Millions	Jan. 19, 2021 USD ($)
Aurora
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common shares received	$ 1,277
Apparate
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Derecognition of ATG Business' non-controlling interests	$ 1,057
Vesting term	12 months
Liability recognized for future obligations	$ 315
Apparate \| Aurora
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common shares received	$ 1,300
Equity interest received, diluted (in percent)	22.00%
Equity interest received, basic (in percent)	25.00%
Additional investment	$ 400
Additional equity interest received, diluted (in percent)	4.00%
Additional equity interest received, basic (in percent)	5.00%

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