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Investigations, Claims and Litigation (Unaudited) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2007	Sep. 30, 2021	Feb. 16, 2018	May 04, 2012
United States Postal Service
Loss Contingencies
Contract award	$ 875
False Claims Act \| Threatened Litigation \| United States Postal Service
Loss Contingencies
CounterclaimForDamagesSought			$ 193
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
Maximum \| United States Postal Service
Loss Contingencies
Loss Contingency, Estimate of Possible Loss		$ 410