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Tax Matters (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Foreign currency translation adjustments, net [1] $ 27 $ (34)
Unrealized holding gains/(losses) on derivative financial instruments, net 59 (4)
Reclassification adjustments for (gains)/losses included in net income (55) (7)
Derivatives qualifying as hedges, tax, total 4 (9)
Unrealized holding gains on available-for-sale securities, net 5 20
Reclassification adjustments for (gains)/losses included in net income 1 (22)
Available-for-sale securities, tax, total 7 (47)
Benefit plans: actuarial gains, net 0 38
Reclassification adjustments related to amortization 3 14
Reclassification adjustments related to settlements, net 0 9
Other (5) (20)
Defined benefit plans, actuarial gain (loss), tax, total (2) 677
Reclassification adjustments related to amortization of prior service costs and other, net (11) (11)
Reclassification adjustments related to curtailments of prior service costs and other, net 0 (7)
Other 0 6
Pension and other postretirement benefit plans, net prior service cost (credit), tax (11) (155)
Tax provision on other comprehensive income [2] 25 432
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 1
Reclassification adjustments of certain tax effects from AOCI to Retained earnings [3] 0 637
Reclassification adjustments of certain tax effects from AOCI to Retained earnings [3] 0 (144)
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 $ (45)
[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. Basis of Presentation and Significant Accounting Policies: Adoption of New Accounting Standards in 2018 in our 2018 Financial Report.
[4] For additional information on the adoption of a new accounting standard related to financial assets and liabilities, see Note 1B. Basis of Presentation and Significant Accounting Policies: Adoption of New Accounting Standards in 2018 in our 2018 Financial Report.