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Accumulated Other Comprehensive Loss | 9 Months Ended
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Sep. 30, 2021
Accumulated Other Comprehensive Income [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss
($ in millions) | Unrealized Foreign Currency Translation Adjustments |  | Pension and Other Postretirement Benefit Adjustments, net of tax (c) |  | Unrealized Gain on Derivatives, net of tax |  | Accumulated Other Comprehensive Loss
January 1, 2021 |  | ($1,663) |  |  |  | ($937) |  |  |  | $1 |  |  |  | ($2,599) |
Current year deferrals to AOCI (a) | (402) |  |  |  | (5) |  |  |  | — |  |  |  | (407) |  |
Current year deferrals to AOCI, net of tax (b) | 131 |  |  |  | — |  |  |  | — |  |  |  | 131 |  |
Reclassifications from AOCI to net income | — |  |  |  | 4 |  |  |  | — |  |  |  | 4 |  |
Period change |  | ($271) |  |  |  | ($1) |  |  |  | $— |  |  |  | ($272) |
September 30, 2021 |  | ($1,934) |  |  |  | ($938) |  |  |  | $1 |  |  |  | ($2,871) |
January 1, 2020 |  | ($1,627) |  |  |  | ($724) |  |  |  | $1 |  |  |  | ($2,350) |
Current year deferrals to AOCI (a) | (357) |  |  |  | — |  |  |  | — |  |  |  | (357) |  |
Current year deferrals to AOCI, net of tax (b) | (90) |  |  |  | (7) |  |  |  | — |  |  |  | (97) |  |
Reclassifications from AOCI to net income | — |  |  |  | 16 |  |  |  | — |  |  |  | 16 |  |
Period change |  | ($447) |  |  |  | $9 |  |  |  | $— |  |  |  | ($438) |
September 30, 2020 |  | ($2,074) |  |  |  | ($715) |  |  |  | $1 |  |  |  | ($2,788) |
(a)Except for income taxes of $1 million as of September 30, 2021 and $7 million as of September 30, 2020 related to foreign currency impacts of certain unasserted earnings, unrealized foreign currency translation adjustments related to translation of foreign denominated balance sheets are not presented net of tax given that no deferred U.S. income taxes have been provided on undistributed earnings of non-U.S. subsidiaries because they are deemed to be reinvested for an indefinite period of time. (b)The tax cost (benefit) related to unrealized foreign currency translation adjustments on tax inter-branch transactions and net investment hedges as of September 30, 2021 and 2020 was $40 million and $(27) million, respectively. (c)The tax cost related to the adjustment for pension and other postretirement benefits as of September 30, 2021 and 2020 wa s $1 million and $5 million, respectively. Reclassifications from AOCI are included in the computation of net periodic benefit costs (See Note 11, "Pensions and Other Postretirement Benefits").

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- Definition Accumulated Other Comprehensive Income [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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