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Pension and Postretirement Benefit Plans and Defined Contribution Plans - Amounts Recognized in Accumulated Other Comprehensive (Loss)/Income (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial losses | [1] | $ (202) | $ (293)
Prior service (costs)/credits |  | 994 | 1,190
Total |  | 792 | 897
United States [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial losses | [1] | (5,061) | (4,677)
Prior service (costs)/credits |  | 1 | (23)
Total |  | (5,060) | (4,699)
United States [Member] | U.S. Supplemental (Non-Qualified) Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial losses | [1] | (370) | (561)
Prior service (costs)/credits |  | 1 | 1
Total |  | (370) | (559)
Foreign Plan [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial losses | [1] | (2,372) | (2,322)
Prior service (costs)/credits |  | 0 | 34
Total |  | $ (2,372) | $ (2,288)
[1] | The accumulated actuarial losses primarily represent the impact of changes in discount rates and other assumptions that result in cumulative changes in our PBO, as well as the cumulative difference between the expected return and actual return on plan assets. These accumulated actuarial losses are recognized in Accumulated other comprehensive loss and are amortized into net periodic benefit costs primarily over the average remaining service period for active participants for plans that are not frozen or the expected life expectancy of plan participants for frozen plans, using the corridor approach.

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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