Current Receivables - Narrative (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total current receivables, gross | $ 6,739 | $ 6,296 |
| Less: Allowance for doubtful accounts | (323) | (327) |
| Total current receivables, net | 6,416 | 5,969 |
| Customer receivables | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total current receivables, gross | 5,448 | 4,974 |
| Related parties | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total current receivables, gross | 495 | 653 |
| Other | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total current receivables, gross | $ 796 | $ 669 |