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Pension and Other Benefit Plans - Pension Plan, Net Periodic Costs and Other Changes (Details) - Defined Benefit Pension Plans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 30, 2016
Dec. 31, 2017
Dec. 30, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 30 $ 6 $ 96 $ 17
Interest cost 63 20 184 62
Expected return on assets (133) (40) (393) (123)
Amortization of prior service costs (5) (4) (13) (13)
Contractual termination benefit 10 0 21 0
Curtailment gain (40) 0 (40) 0
Recognition of actuarial loss 23 0 23 0
Net periodic pension benefit $ (52) $ (18) $ (122) $ (57)
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]        
Discount or settlement rates     2.40% 3.10%
Expected long-term rates of return on assets     5.00% 6.30%
Rates of increase in compensation levels     2.70% 2.60%