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Accumulated Other Comprehensive Income/(Loss) (Tables) | 3 Months Ended
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Mar. 31, 2021
Accumulated Other Comprehensive Income/(Loss) [Abstract] |
After-Tax Components Of Accumulated Other Comprehensive Loss | Reclassifications out of accumulated other comprehensive income/loss for the three months ended March 31, 2021 and 2020, were as follows (net of tax):
Millions | Defined ‎benefit ‎plans | Foreign ‎currency ‎translation | Total
Balance at January 1, 2021 | $ | (1,381) | $ | (212) | $ | (1,593)
Other comprehensive income/(loss) before reclassifications |  | (1) |  | (26) |  | (27)
Amounts reclassified from accumulated other comprehensive income/(loss) [a] |  | 26 |  | - |  | 26
Net year-to-date other comprehensive income/(loss), ‎net of taxes of ($8) million |  | 25 |  | (26) |  | (1)
Balance at March 31, 2021 | $ | (1,356) | $ | (238) | $ | (1,594)
Balance at January 1, 2020 | $ | (1,150) | $ | (206) | $ | (1,356)
Other comprehensive income/(loss) before reclassifications |  | 2 |  | 5 |  | 7
Amounts reclassified from accumulated other comprehensive income/(loss) [a] |  | 20 |  | - |  | 20
Net year-to-date other comprehensive income/(loss), ‎net of taxes of ($7) million |  | 22 |  | 5 |  | 27
Balance at March 31, 2020 | $ | (1,128) | $ | (201) | $ | (1,329)
[a]The accumulated other comprehensive income/loss reclassification components are 1) prior service cost/credit and 2) net actuarial loss which are both included in the computation of net periodic pension cost. See Note 5 Retirement Plans for additional details.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 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=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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