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Derivative Instruments - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Offsetting Liabilities [Line Items]    
Maximum maturity of foreign currency exchange contracts 18 months  
Net derivative losses related to cash flow hedges to be reclassified into earnings within the next 12 months $ (126,000,000)  
Derivative asset, offset 52,000,000 $ 56,000,000
Derivative liability, offset 56,000,000  
Cash collateral posted related to derivative liabilities 70,000,000 38,000,000
Other current liabilities    
Offsetting Liabilities [Line Items]    
Counterpary cash collateral $ 6,000,000 $ 0