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Financial Instruments - Fair Value Hierarchy Levels of Assets and Liabilities Value on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments at fair value through profit and loss $ 392 $ 0
Fair Value, measurements, recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 552 74
Investments at fair value through profit and loss 392 0
Total Liabilities 139 (121)
Fair Value, measurements, recurring | Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 0 1
Fair Value, measurements, recurring | Foreign exchange derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 83 29
Total Liabilities 93 (92)
Fair Value, measurements, recurring | Interest rate derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 77 44
Total Liabilities 46 (29)
Fair Value, measurements, recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 392 1
Investments at fair value through profit and loss 392 0
Total Liabilities 0 0
Fair Value, measurements, recurring | Level 1 | Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 0 1
Fair Value, measurements, recurring | Level 1 | Foreign exchange derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 0 0
Total Liabilities 0 0
Fair Value, measurements, recurring | Level 1 | Interest rate derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 0 0
Total Liabilities 0 0
Fair Value, measurements, recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 160 73
Investments at fair value through profit and loss 0 0
Total Liabilities 139 (121)
Fair Value, measurements, recurring | Level 2 | Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 0 0
Fair Value, measurements, recurring | Level 2 | Foreign exchange derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 83 29
Total Liabilities 93 (92)
Fair Value, measurements, recurring | Level 2 | Interest rate derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 77 44
Total Liabilities $ 46 $ (29)