Pension and Other Benefit Plans - Pension Plan, Net Periodic Costs and Other Changes (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2017	Jul. 01, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 32	$ 6
Interest cost	60	21
Expected return on assets	(128)	(43)
Amortization of prior service costs	(4)	(5)
Contractual termination benefit	9	0
Net periodic pension expense (income)	$ (31)	$ (21)
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Discount or settlement rates	2.50%	3.10%
Expected long-term rates of return on assets	4.90%	6.30%
Rates of increase in compensation levels	2.70%	2.60%