Financial Instruments and Risk Management (Details) - USD ($)
$ in Millions |
12 Months Ended |
|
Dec. 31, 2019 |
Dec. 31, 2018 |
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Number of days from period end |
2 days
|
|
| Foreign Currency Derivatives [Abstract] |
|
|
| Maximum term of currency derivative instruments (in years) |
1 year
|
|
| Long-term Debt, Percentage Bearing Fixed Interest, Amount |
$ 10,300
|
$ 10,300
|
| Estimate of Fair Value, Fair Value Disclosure |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Total debt |
11,961
|
10,767
|
| Estimate of Fair Value, Fair Value Disclosure | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Total debt |
11,093
|
6,726
|
| Estimate of Fair Value, Fair Value Disclosure | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Total debt |
868
|
4,041
|
| Estimate of Fair Value, Fair Value Disclosure | Level 3 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Total debt |
0
|
0
|
| Carrying (Reported) Amount, Fair Value Disclosure |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt, Long-term and Short-term, Combined Amount |
10,327
|
10,344
|
| Foreign Exchange Contract [Member] | Other current assets | Level 2 |
|
|
| Interest Rate Derivatives [Abstract] |
|
|
| Derivative, Notional Amount |
513
|
591
|
| Foreign Exchange Contract [Member] | Other assets | Level 2 |
|
|
| Interest Rate Derivatives [Abstract] |
|
|
| Derivative, Notional Amount |
$ 100
|
$ 100
|