Long-Term Debt and Short-Term Borrowings - Credit Facilities (Details) $ in Millions |
1 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2016
USD ($)
|
Dec. 31, 2018
USD ($)
|
|
| Five-year credit facility agreement | ||
| Debt instrument | ||
| Term of debt instrument | 5 years | 5 years |
| Credit facility amount prior to new agreement | $ 2,250 | |
| Current borrowing capacity | $ 3,750 | |
| Maximum increase available subject to lender approval | 1,250 | |
| Maximum borrowing capacity including portion subject to lender approval | $ 5,000 | |
| Required minimum EBITDA to Interest Ratio | 3.0 | |
| Number of consecutive quarters over which the ratio of required EBITDA to Interest Ratio is calculated | 4 | |
| Actual EBITDA to Interest Ratio | 25 | |
| Stand alone letters of credit and bank guarantees | ||
| Debt instrument | ||
| Amount of stand alone letters of credit and bank guarantees outstanding utilized in connection with normal business activities | $ 243 |