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Provision for Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]                      
United States                 $ 354 $ (364) $ 43
Outside United States                 2,770 1,818 7,841
Earnings before income taxes                 3,124 1,454 7,884
United States federal current                 1,322 (227) (90)
United States federal deferred                 (1,256) 141 136
Federal income tax                 66 (86) 46
State and local current                 33 7 6
State and local deferred                 33 8 (3)
State and local taxes                 66 15 3
Total United States                 132 (71) 49
Outside United States current                 541 490 707
Outside United States deferred                 15 (290) (163)
Total outside United States                 556 200 544
Total provision for income taxes $ (178) $ (272) $ (84) $ (154) $ 78 $ (40) $ (118) $ (49) $ 688 $ 129 $ 593