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Tax Matters (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Foreign currency translation adjustments, net [1] $ 14 $ (62) $ 82 $ (192)
Unrealized holding gains/(losses) on derivative financial instruments, net 35 28 39 30
Reclassification adjustments for (gains)/losses included in net income (28) (29) 36 (169)
Derivatives qualifying as hedges, tax, total 7 (1) 77 (139)
Unrealized holding gains/(losses) on available-for-sale securities, net 20 37 (8) 93
Reclassification adjustments for gains included in net income (6) (49) (8) (45)
Available-for-sale securities, tax, total 14 (12) (62) 47
Benefit plans: actuarial gains/(losses), net 2 (37) 27 (15)
Reclassification adjustments related to amortization 15 60 43 152
Reclassification adjustments related to settlements, net 10 22 25 30
Other 11 (33) 18 (46)
Defined benefit plans, actuarial gain (loss), tax, total 38 11 750 121
Benefit plans: prior service costs and other, net 0 0 0 0
Reclassification adjustments related to amortization (11) (17) (33) (50)
Reclassification adjustments related to curtailments, net (1) (1) (4) (5)
Other 1 1 1 1
Pension and other postretirement benefit plans, net prior service cost (credit), tax (11) (17) (179) (55)
Tax provision/(benefit) on other comprehensive income/(loss) [2] 62 (80) 667 (218)
ASU 2018-02 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification adjustments of certain tax effects from AOCI to Retained earnings [3] 0 0 1 0
Reclassification adjustments of certain tax effects from AOCI to Retained earnings [3] 0 0 637 0
Reclassification adjustments of certain tax effects from AOCI to Retained earnings [3] 0 0 (144) 0
ASU 2016-01 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification adjustments for tax on unrealized gains from AOCI to Retained earnings [4] $ 0 $ 0 $ (45) $ 0
[1] Taxes are not provided for foreign currency translation adjustments relating to investments in international subsidiaries that will be held indefinitely.
[2] Amounts may not add due to rounding.
[3] For additional information on the adoption of a new accounting standard related to reclassification of certain tax effects from AOCI, see Note 1B.
[4] For additional information on the adoption of a new accounting standard related to financial assets and liabilities, see Note 1B.