Fair Value Measurements - Financial Assets and (Liabilities) Required Fair Value Measurement on Recurring Basis (Details) - Recurring Measurement Basis - USD ($)
$ in Millions |
Sep. 30, 2019 |
Dec. 31, 2018 |
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Assets |
$ 10
|
$ 23
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Contingent consideration |
122
|
130
|
| Liabilities |
209
|
163
|
| Interest rate swaps |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
|
3
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Derivative liability (less than $1 million for foreign currency forward contracts in September 30,2019) |
87
|
31
|
| Energy derivative |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
|
7
|
| Foreign currency forward contracts |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
10
|
12
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Derivative liability (less than $1 million for foreign currency forward contracts in September 30,2019) |
1
|
2
|
| Congestion revenue rights |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
1
|
1
|
| Level 1 |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Assets |
0
|
0
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Contingent consideration |
0
|
0
|
| Liabilities |
0
|
0
|
| Level 1 | Interest rate swaps |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
|
0
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Derivative liability (less than $1 million for foreign currency forward contracts in September 30,2019) |
0
|
0
|
| Level 1 | Energy derivative |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
|
0
|
| Level 1 | Foreign currency forward contracts |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
0
|
0
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Derivative liability (less than $1 million for foreign currency forward contracts in September 30,2019) |
0
|
0
|
| Level 1 | Congestion revenue rights |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
0
|
0
|
| Level 2 |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Assets |
10
|
15
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Contingent consideration |
0
|
0
|
| Liabilities |
87
|
33
|
| Level 2 | Interest rate swaps |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
|
3
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Derivative liability (less than $1 million for foreign currency forward contracts in September 30,2019) |
87
|
31
|
| Level 2 | Energy derivative |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
|
0
|
| Level 2 | Foreign currency forward contracts |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
10
|
12
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Derivative liability (less than $1 million for foreign currency forward contracts in September 30,2019) |
0
|
2
|
| Level 2 | Congestion revenue rights |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
0
|
0
|
| Level 3 |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Assets |
0
|
8
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Contingent consideration |
122
|
130
|
| Liabilities |
122
|
130
|
| Level 3 | Interest rate swaps |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
|
0
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Derivative liability (less than $1 million for foreign currency forward contracts in September 30,2019) |
0
|
0
|
| Level 3 | Energy derivative |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
|
7
|
| Level 3 | Foreign currency forward contracts |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
0
|
0
|
| Liabilities, Fair Value Disclosure [Abstract] |
|
|
| Derivative liability (less than $1 million for foreign currency forward contracts in September 30,2019) |
0
|
0
|
| Level 3 | Congestion revenue rights |
|
|
| Assets, Fair Value Disclosure [Abstract] |
|
|
| Derivative asset (less than $1 million for congestion revenue rights in September 30, 2019) |
$ 0
|
$ 1
|