Investigations, Claims and Litigation (Unaudited) (Details) € in Millions, R$ in Millions, $ in Millions		12 Months Ended	63 Months Ended		69 Months Ended			71 Months Ended		73 Months Ended
	Dec. 28, 2018 USD ($)	Dec. 31, 2007 USD ($)	Nov. 13, 2018 BRL (R$)	Nov. 13, 2018 USD ($)	Jun. 30, 2019 EUR (€)	Jun. 30, 2019 BRL (R$)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 BRL (R$) Defendant	Jun. 30, 2019 USD ($) Defendant	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 16, 2018 USD ($)	May 04, 2012 USD ($)
Loss Contingencies
Unbilled receivables, net							$ 5,657		$ 5,657	$ 5,657	$ 5,026
United States Postal Service
Loss Contingencies
CounterclaimForDamagesSought												$ 193
Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Damages Sought, Value								R$ 111	$ 29
Counterclaim					€ 31		35
Loss Contingency, Damages Awarded, Value			R$ 41	$ 11
Orbital ATK
Loss Contingencies
Loss Contingency, Damages Awarded, Value	$ 108
Unpaid Portions of Contract Price and Direct Costs Incurred [Member] | United States Postal Service
Loss Contingencies
Unbilled receivables, net													$ 63
Acts and Omissions with Adverse Affects on Performance and Obligations [Member] | United States Postal Service
Loss Contingencies
Gain contingency, unrecorded amount													$ 115
United States Postal Service
Loss Contingencies
Contract award		$ 875
United States Postal Service | False Claims Act | Threatened Litigation
Loss Contingencies
Loss Contingency, Damages Sought, Value										179
Solystic Matter [Member] | Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Number of Additional Defendants | Defendant								2	2
Initial Claim [Member] | Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Damages Sought, Value								R$ 89	$ 23
Incremental claim [Member] | Solystic Matter [Member]
Loss Contingencies
Loss Contingency, Damages Sought, Value						R$ 22	6
Maximum | United States Postal Service
Loss Contingencies
Loss Contingency, Estimate of Possible Loss							$ 410		$ 410	$ 410