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Income Taxes (Components of Deferred Tax Assets and Liabilities and Related Valuation Allowances) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Employee compensation and benefits $ 88 $ 149
Foreign tax credit carryforwards 200 243
Loss carryforwards 111 105
Other credit carryforwards 27 31
Insurance accruals 10 8
Allowance for bad debt 4 4
Lease obligation and accrued liabilities 82 82
Contract liabilities 35 7
Other 56 67
Total gross deferred tax assets 613 696
Valuation allowances (204) (220)
Net deferred tax assets 409 476
Deferred tax liabilities:    
Right-of-use assets (37) (37)
Intangible amortization (103) (80)
Indefinite-lived intangible amortization (72) (60)
Other (41) (28)
Total gross deferred tax liabilities (253) (205)
Deferred tax assets, net $ 156 $ 271