Subsequent Events (Details) - Subsequent Event [Member] - Scenario, Forecast [Member] $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Minimum [Member]
Subsequent Event [Line Items]
Severance costs	$ 60
Minimum [Member] | One-time Termination Benefits [Member]
Subsequent Event [Line Items]
Severance costs	45
Minimum [Member] | Elimination of Service Requirements for Equity Awards [Member]
Subsequent Event [Line Items]
Severance costs	15
Maximum [Member]
Subsequent Event [Line Items]
Severance costs	70
Maximum [Member] | One-time Termination Benefits [Member]
Subsequent Event [Line Items]
Severance costs	50
Maximum [Member] | Elimination of Service Requirements for Equity Awards [Member]
Subsequent Event [Line Items]
Severance costs	$ 20