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Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets    
Accrued expenses $ 269 $ 377
Retirement benefits 248 411
Tax credits and net operating losses 834 747
Valuation allowances (483) (150)
Total deferred tax assets 868 1,385
Deferred tax liabilities    
Subsidiaries’ unremitted earnings 35 145
Asset basis differences 705 704
Total deferred tax liabilities 740 849
Net deferred tax asset $ 128 $ 536