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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 3,861 $ 3,479 $ 3,900 $ 4,996
Total other comprehensive income (loss), net of tax 41 49 7 (86)
Ending balance 4,011 3,516 4,011 3,516
Cumulative Translation Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (481)  
Other comprehensive loss before reclassifications     (10)  
Amounts reclassified to earnings     0  
Total other comprehensive income (loss), net of tax     (10)  
Ending balance (491)   (491)  
Pension and  Postretirement Costs        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (356)  
Other comprehensive loss before reclassifications     0  
Amounts reclassified to earnings     9  
Total other comprehensive income (loss), net of tax     9  
Ending balance (347)   (347)  
Derivative Financial Instruments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (43)  
Other comprehensive loss before reclassifications     (1)  
Amounts reclassified to earnings     9  
Total other comprehensive income (loss), net of tax     8  
Ending balance (35)   (35)  
AOCL        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (914) (1,055) (880) (920)
Other comprehensive loss before reclassifications     (11)  
Amounts reclassified to earnings     18  
Total other comprehensive income (loss), net of tax     7  
Ending balance $ (873) $ (1,006) $ (873) $ (1,006)