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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance, income taxes $ (39) $ 26
Changes in value, income taxes (6) 10
Amounts reclassified to earnings, income taxes (3) (6)
Amounts reclassified to retained earnings, income taxes [1] 0  
Net change, income taxes (9) 4
Ending Balance, income taxes (48) 30
Beginning Balance, net of tax [2] 8,734  
Changes in value, net of tax 13 (16)
Amounts reclassified to earnings, net of tax 13  
Amounts reclassified to retained earnings, net of tax [1] 7  
Total other comprehensive income (loss), net 33 (7) [3]
Ending Balance, net of tax 8,336  
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance, net of tax (1,147) (829)
Amounts reclassified to earnings, net of tax   9
Ending Balance, net of tax (1,114) (836)
Pension and Other Postretirement Liabilities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance, before tax (1,102) (854)
Changes in value, before tax 23 (26)
Amounts reclassified to earnings, before tax 16 13
Net change, before tax 39 (13)
Ending Balance, before tax (1,063) (867)
Investments and Other    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance, before tax (6) (1)
Changes in value, before tax (4)  
Amounts reclassified to earnings, before tax   2
Amounts reclassified to retained earnings, before tax [1] 7  
Net change, before tax 3 2
Ending Balance, before tax $ (3) $ 1
[1] This amount represents the unrealized loss on the Company's investment in Azul, S.A. ("Azul") which was previously classified as an available-for-sale security.
[2] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[3] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.