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Investments Accounted for Using the Equity Method and Variable Interest Entities, or VIEs - Summarized Financial Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Accounts receivable, net $ 904 $ 1,025
Other non-current assets 216 240
Total Assets 14,902 12,531
Current liabilities 1,915 2,359
Long-term debt 8,855 6,042
Other non-current liabilities 1,066 1,084
Total Liabilities 13,222 10,853
Variable Interest Entity, Primary Beneficiary    
Schedule of Equity Method Investments [Line Items]    
Accounts receivable, net 647 3
Other current assets 2 0
Net property, plant and equipment 0 71
Other non-current assets 0 27
Total Assets 649 101
Current liabilities 78 4
Long-term debt 0 24
Other non-current liabilities 0 8
Total Liabilities 78 36
Redeemable noncontrolling interests 0 20
Net assets less noncontrolling interests $ 571 $ 45