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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Changes in AOCI by Component | Changes in AOCI by component are as follows:
| Three Months Ended March 31,
($ in millions) | Derivatives |  | Investments |  | Employee Benefit Plans |  | Cumulative Translation Adjustment |  | Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2020, net of taxes | $ | 31 |  |  | $ | 18 |  |  | $ | (4,261) |  |  | $ | (1,981) |  |  | $ | (6,193) |
Other comprehensive income (loss) before reclassification adjustments, pretax | 178 |  |  | 3 |  |  | — |  |  | (333) |  |  | (152) |
Tax | (37) |  |  | — |  |  | 5 |  |  | (11) |  |  | (43) |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 141 |  |  | 3 |  |  | 5 |  |  | (344) |  |  | (195) |
Reclassification adjustments, pretax | (47) |  | (1) | (21) |  | (2) | 69 |  | (3) | — |  |  | 1 |
Tax | 10 |  |  | — |  |  | (14) |  |  | — |  |  | (4) |
Reclassification adjustments, net of taxes | (37) |  |  | (21) |  |  | 55 |  |  | — |  |  | (3) |
Other comprehensive income (loss), net of taxes | 104 |  |  | (18) |  |  | 60 |  |  | (344) |  |  | (198) |
Balance March 31, 2020, net of taxes | $ | 135 |  |  | $ | — |  |  | $ | (4,201) |  |  | $ | (2,325) |  |  | $ | (6,391) |
Balance January 1, 2021, net of taxes | $ | (266) |  |  | $ | — |  |  | $ | (4,540) |  |  | $ | (1,828) |  |  | $ | (6,634) |
Other comprehensive income (loss) before reclassification adjustments, pretax | 180 |  |  | — |  |  | (4) |  |  | (211) |  |  | (35) |
Tax | (38) |  |  | — |  |  | (1) |  |  | (88) |  |  | (127) |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 142 |  |  | — |  |  | (5) |  |  | (299) |  |  | (162) |
Reclassification adjustments, pretax | 111 |  | (1) | — |  |  | 87 |  | (3) | — |  |  | 198 |
Tax | (23) |  |  | — |  |  | (1) |  |  | — |  |  | (24) |
Reclassification adjustments, net of taxes | 88 |  |  | — |  |  | 86 |  |  | — |  |  | 174 |
Other comprehensive income (loss), net of taxes | 230 |  |  | — |  |  | 81 |  |  | (299) |  |  | 12 |
Balance March 31, 2021, net of taxes | $ | (36) |  |  | $ | — |  |  | $ | (4,459) |  |  | $ | (2,127) |  |  | $ | (6,622) |
(1) Primarily relates to foreign currency cash flow hedges that were reclassified from AOCI to Sales. (2) Represents net realized (gains) losses on the sales of available-for-sale debt securities that were reclassified from AOCI to Other (income) expense, net. (3) Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 10).

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