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Tax Matters - Taxes on Items of Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Tax Expense/(Benefit) on Other Comprehensive Income/(Loss) |  |  |  |
Foreign currency translation adjustments, net | [1] | $ 94 | $ (215) | $ (15)
Unrealized holding gains/(losses) on derivative financial instruments, net |  | 21 | 72 | (75)
Reclassification adjustments for (gains)/losses included in net income |  | 27 | (224) | 158
Other comprehensive income (loss), derivatives qualifying as hedges, tax, total |  | 50 | (152) | 83
Unrealized holding gains/(losses) on available-for-sale securities, net |  | (23) | 102 | 49
Reclassification adjustments for (gains)/losses included in net income |  | 16 | (60) | (15)
Other comprehensive income (loss), available-for-sale securities, tax, total |  | (53) | 42 | 34
Benefit plans: actuarial losses, net |  | (141) | (59) | (535)
Reclassification adjustments related to amortization |  | 55 | 192 | 186
Reclassification adjustments related to settlements, net |  | 33 | 42 | 45
Other |  | 29 | (39) | 36
Defined benefit plan, amounts recognized in other comprehensive income (loss), net actuarial gain (loss), tax |  | 612 | 137 | (269)
Benefit plans: prior service (costs)/credits and other, net |  | 2 | 0 | 67
Reclassification adjustments related to amortization |  | (39) | (67) | (64)
Reclassification adjustments related to curtailments, net |  | (4) | (7) | (10)
Other |  | 0 | 0 | (1)
Other comprehensive income (loss), pension and other postretirement benefit plans, net prior service cost (credit), tax |  | (185) | (74) | (7)
Tax provision/(benefit) on other comprehensive income/(loss) | [2],[3] | 518 | (262) | (174)
Reclassification of Certain Tax Effects from AOCI [Member] |  |  |  |
Tax Expense/(Benefit) on Other Comprehensive Income/(Loss) |  |  |  |
Reclassification adjustments of certain tax effects from AOCI to Retained earnings | [4] | 1 | 0 | 0
Reclassification adjustments of certain tax effects from AOCI to Retained earnings | [4] | 637 | 0 | 0
Reclassification adjustments of certain tax effects from AOCI to Retained earnings | [4] | (144) | 0 | 0
Financial Assets and Liabilities [Member] |  |  |  |
Tax Expense/(Benefit) on Other Comprehensive Income/(Loss) |  |  |  |
Reclassification adjustments for tax on unrealized gains from AOCI to Retained earnings | [5] | $ (45) | $ 0 | $ 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] | See Note 5E. Tax Matters: Tax Provision/(Benefit) on Other Comprehensive Income/(Loss).
[4] | For additional information on the adoption of a new accounting standard related to reclassification of certain tax effects from AOCI, see Note 1B.
[5] | For additional information on the adoption of a new accounting standard related to financial assets and liabilities, see Note 1B.

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