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Equity Investments (Tables)
12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Carrying Value of Nonmarketable Equity Securities The following table summarizes our equity investments that were measured using measurement alternative and equity method (in millions):
December 31,
20212020
Equity investments under measurement alternative:
Initial cost$6,480$6,171
Cumulative upward adjustments31126
Cumulative impairment/downward adjustments(50)(25)
Carrying value6,7416,172
Equity investments under equity method3462
Total equity investments$6,775$6,234