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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Changes in AOCI by Component | Changes in AOCI by component are as follows:
| Three Months Ended June 30,
($ in millions) | Derivatives |  | Investments |  | Employee Benefit Plans |  | Cumulative Translation Adjustment |  | Accumulated Other Comprehensive Income (Loss)
Balance April 1, 2017, net of taxes | $ | 106 |  |  | $ | 40 |  |  | $ | (3,180 | ) |  | $ | (2,046 | ) |  | $ | (5,080 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | (169 | ) |  | 26 |  |  | 29 |  |  | (25 | ) |  | (139 | )
Tax | 59 |  |  | 3 |  |  | (3 | ) |  | 72 |  |  | 131 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (110 | ) |  | 29 |  |  | 26 |  |  | 47 |  |  | (8 | )
Reclassification adjustments, pretax | (50 | ) | (1) | 8 |  | (2) | 27 |  | (3) | — |  |  | (15 | )
Tax | 17 |  |  | (2 | ) |  | (6 | ) |  | — |  |  | 9 |
Reclassification adjustments, net of taxes | (33 | ) |  | 6 |  |  | 21 |  |  | — |  |  | (6 | )
Other comprehensive income (loss), net of taxes | (143 | ) |  | 35 |  |  | 47 |  |  | 47 |  |  | (14 | )
Balance June 30, 2017, net of taxes | $ | (37 | ) |  | $ | 75 |  |  | $ | (3,133 | ) |  | $ | (1,999 | ) |  | $ | (5,094 | )
Balance April 1, 2018, net of taxes | $ | (201 | ) |  | $ | (167 | ) |  | $ | (3,095 | ) |  | $ | (1,597 | ) |  | $ | (5,060 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | 265 |  |  | (17 | ) |  | (1 | ) |  | (301 | ) |  | (54 | )
Tax | (56 | ) |  | — |  |  | 1 |  |  | (60 | ) |  | (115 | )
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 209 |  |  | (17 | ) |  | — |  |  | (361 | ) |  | (169 | )
Reclassification adjustments, pretax | 72 |  | (1) | 20 |  | (2) | 40 |  | (3) | — |  |  | 132 |
Tax | (15 | ) |  | — |  |  | (10 | ) |  | — |  |  | (25 | )
Reclassification adjustments, net of taxes | 57 |  |  | 20 |  |  | 30 |  |  | — |  |  | 107 |
Other comprehensive income (loss), net of taxes | 266 |  |  | 3 |  |  | 30 |  |  | (361 | ) |  | (62 | )
Balance June 30, 2018, net of taxes | $ | 65 |  |  | $ | (164 | ) |  | $ | (3,065 | ) |  | $ | (1,958 | ) |  | $ | (5,122 | )
| Six Months Ended June 30,
($ in millions) | Derivatives |  | Investments |  | Employee Benefit Plans |  | Cumulative Translation Adjustment |  | Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2017, net of taxes | $ | 338 |  |  | $ | (3 | ) |  | $ | (3,206 | ) |  | $ | (2,355 | ) |  | $ | (5,226 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | (432 | ) |  | 113 |  |  | 25 |  |  | 238 |  |  | (56 | )
Tax | 151 |  |  | (4 | ) |  | 6 |  |  | 118 |  |  | 271 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (281 | ) |  | 109 |  |  | 31 |  |  | 356 |  |  | 215 |
Reclassification adjustments, pretax | (145 | ) | (1) | (49 | ) | (2) | 55 |  | (3) | — |  |  | (139 | )
Tax | 51 |  |  | 18 |  |  | (13 | ) |  | — |  |  | 56 |
Reclassification adjustments, net of taxes | (94 | ) |  | (31 | ) |  | 42 |  |  | — |  |  | (83 | )
Other comprehensive income (loss), net of taxes | (375 | ) |  | 78 |  |  | 73 |  |  | 356 |  |  | 132 |
Balance June 30, 2017, net of taxes | $ | (37 | ) |  | $ | 75 |  |  | $ | (3,133 | ) |  | $ | (1,999 | ) |  | $ | (5,094 | )
Balance January 1, 2018, net of taxes | $ | (108 | ) |  | $ | (61 | ) |  | $ | (2,787 | ) |  | $ | (1,954 | ) |  | $ | (4,910 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | 84 |  |  | (133 | ) |  | (2 | ) |  | 18 |  |  | (33 | )
Tax | (18 | ) |  | 1 |  |  | 4 |  |  | (122 | ) |  | (135 | )
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 66 |  |  | (132 | ) |  | 2 |  |  | (104 | ) |  | (168 | )
Reclassification adjustments, pretax | 164 |  | (1) | 36 |  | (2) | 81 |  | (3) | — |  |  | 281 |
Tax | (34 | ) |  | — |  |  | (17 | ) |  | — |  |  | (51 | )
Reclassification adjustments, net of taxes | 130 |  |  | 36 |  |  | 64 |  |  | — |  |  | 230 |
Other comprehensive income (loss), net of taxes | 196 |  |  | (96 | ) |  | 66 |  |  | (104 | ) |  | 62 |
Reclassification of provisional stranded tax effects (see Note 1) | (23 | ) |  | 1 |  |  | (344 | ) |  | 100 |  |  | (266 | )
Adoption of ASU 2016-01 (see Note 1) | — |  |  | (8 | ) |  | — |  |  | — |  |  | (8 | )
Balance June 30, 2018, net of taxes | $ | 65 |  |  | $ | (164 | ) |  | $ | (3,065 | ) |  | $ | (1,958 | ) |  | $ | (5,122 | )
(1) | 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 investments that were reclassified from AOCI to Other (income) expense, net. In 2017, these amounts included both debt and equity investments; however, upon adoption of ASU 2016-01 in 2018 (see Note 1), these amounts relate only to available-for-sale debt investments.
(3) | Includes net amortization of prior service cost and actuarial gains and losses included in net periodic benefit cost (see Note 11).

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=114867106&loc=SL7669686-108580 + Details
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