Income Taxes - Net Deferred Tax Liability (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Components Of Deferred Tax Assets And Liabilities [Abstract]
Deferred revenue	$ 11	$ 9
Employee benefits	102	95
Bad debt reserves	7	7
Pension	30	34
Net operating loss carryforward	10	11
Foreign tax credit	4	7
Operating lease liabilities	58	66
Payroll taxes	5	12
Other	6	5
Deferred tax assets before valuation allowance	233	246
Valuation allowance	(8)	(9)
Deferred tax assets	225	237
Depreciable and amortizable assets	274	271
Claims and related salvage	89	90
Investments in affiliates	63	7
Securities	65	75
Operating lease assets	52	59
Unremitted foreign earnings	13	12
Deferred tax liabilities	556	514
Net deferred tax liability	$ 331	$ 277