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Fair Value of Financial Assets and Liabilities - Nonrecurring (Details) - Nonrecurring - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 2,272 $ 2,740
Accounts receivable, net 789 1,236
Short-term debt and current portion of long-term debt 1,793 1,049
Long-term debt 2,185 3,233
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,272 2,740
Accounts receivable, net 789 1,236
Short-term debt and current portion of long-term debt 1,814 1,054
Long-term debt $ 2,193 $ 3,331