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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2021
Accumulated Other Comprehensive Income [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
($ 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 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=124509347&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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