Restructuring (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |
---|---|---|---|
Mar. 31, 2017 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
Restructuring Cost and Reserve [Line Items] | |||
Restructuring expenses | $ 24 | ||
Restructuring Reserve | 21 | $ 0 | |
Employee Separation Costs | |||
Restructuring Cost and Reserve [Line Items] | |||
Restructuring expenses | 21 | ||
Restructuring Reserve | 21 | $ 0 | |
Relocation of European Headquarters [Member] | |||
Restructuring Cost and Reserve [Line Items] | |||
Restructuring reserve, additional restructuring costs | $ 24 | ||
Minimum | Scenario, Forecast [Member] | |||
Restructuring Cost and Reserve [Line Items] | |||
Restructuring expenses | $ 5 | ||
Maximum | Scenario, Forecast [Member] | |||
Restructuring Cost and Reserve [Line Items] | |||
Restructuring expenses | $ 10 |