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Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income/(Loss) [Line Items] |  |  |
Accumulated other comprehensive income/(loss) (Note 23) | $ (8,339) | $ (8,294) |
Derivative instruments |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | 116 |  |
Parent Company [Member] |  |  |
Accumulated Other Comprehensive Income/(Loss) [Line Items] |  |  |
Accumulated other comprehensive income/(loss) (Note 23) | (8,339) | (8,294) | $ (7,728)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest | 4 |  |
Foreign currency translation |  |  |
Beginning balance | (5,526) | (4,626) | (4,800)
Gains/(Losses) on foreign currency translation | 200 | (1,107) | 181
Less: Tax/(Tax benefit) (a) | 143 | (206) | 6
Net gains/(losses) on foreign currency translation | 57 | (901) | 175
(Gains)/Losses reclassified from AOCI to net income (b) | (18) | 1 | (1)
Other comprehensive income/(loss), net of tax (c) | 39 | (900) | 174
Ending balance | (5,487) | (5,526) | (4,626)
Marketable securities |  |  |
Beginning balance | 156 | 71 | (59)
Gains/(Losses) on available for sale securities | (209) | 155 | 173
Less: Tax/(Tax benefit) | (52) | 37 | 40
Net gains/(losses) on available for sale securities | (157) | 118 | 133
(Gains)/Losses reclassified from AOCI to net income | (23) | (45) | (3)
Less: Tax/(Tax benefit) | (5) | (12) | 0
Net (gains)/losses reclassified from AOCI to net income | (18) | (33) | (3)
Other comprehensive income/(loss), net of tax | (175) | 85 | 130
Ending balance | (19) | 156 | 71
Derivative instruments |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | (266) | (488) | 201
Gains/(Losses) on derivative instruments | (169) | 207 | (875)
Less: Tax/(Tax benefit) | (20) | 39 | (180)
Net gains/(losses) on derivative instruments | (149) | 168 | (695)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 280 | 66 | 3
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax | 58 | 12 | (3)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax | 222 | 54 | 6
Other comprehensive income/(loss), net of tax | 73 | 222 | (689)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | (193) | (266) | (488)
Pension and other postretirement benefits |  |  |
Beginning balance | (2,658) | (2,685) | (2,708)
Prior service (costs)/credits arising during the period | 0 | (21) | (15)
Less: Tax/(Tax benefit) | 0 | (6) | (2)
Net prior service (costs)/credits arising during the period | 0 | (15) | (13)
Amortization and recognition of prior service costs/(credits) (e) | 27 | 63 | 50
Less: Tax/(Tax benefit) | 6 | 10 | 10
Net prior service costs/(credits) reclassified from AOCI to net income | 21 | 53 | 40
Translation impact on non-U.S. plans | (3) | (11) | (4)
Other comprehensive income/(loss), net of tax | 18 | 27 | 23
Ending balance | $ (2,640) | $ (2,658) | $ (2,685)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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