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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]      
Interest paid $ 648 $ 673 $ 291
Income taxes paid 666 156 197
Treasury stock purchases settled after the balance sheet date 0 0 6
Distribution of nonmonetary assets (see Note 4) 0 726 0
Software obtained under financing arrangements $ 143 $ 308 $ 0