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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Changes in AOCI by Component | Changes in AOCI by component are as follows:
| Three Months Ended September 30,
($ in millions) | Derivatives |  | Investments |  | Employee Benefit Plans |  | Cumulative Translation Adjustment |  | Accumulated Other Comprehensive Income (Loss)
Balance July 1, 2017, net of taxes | $ | (37 | ) |  | $ | 75 |  |  | $ | (3,133 | ) |  | $ | (1,999 | ) |  | $ | (5,094 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | (88 | ) |  | 170 |  |  | 2 |  |  | 23 |  |  | 107 |
Tax | 31 |  |  | (19 | ) |  | (13 | ) |  | 44 |  |  | 43 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (57 | ) |  | 151 |  |  | (11 | ) |  | 67 |  |  | 150 |
Reclassification adjustments, pretax | (14 | ) | (1) | (24 | ) | (2) | 31 |  | (3) | — |  |  | (7 | )
Tax | 5 |  |  | 8 |  |  | (7 | ) |  | — |  |  | 6 |
Reclassification adjustments, net of taxes | (9 | ) |  | (16 | ) |  | 24 |  |  | — |  |  | (1 | )
Other comprehensive income (loss), net of taxes | (66 | ) |  | 135 |  |  | 13 |  |  | 67 |  |  | 149 |
Balance September 30, 2017, net of taxes | $ | (103 | ) |  | $ | 210 |  |  | $ | (3,120 | ) |  | $ | (1,932 | ) |  | $ | (4,945 | )
Balance July 1, 2018, net of taxes | $ | 65 |  |  | $ | (164 | ) |  | $ | (3,065 | ) |  | $ | (1,958 | ) |  | $ | (5,122 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | 29 |  |  | 8 |  |  | — |  |  | (147 | ) |  | (110 | )
Tax | (6 | ) |  | — |  |  | — |  |  | 11 |  |  | 5 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 23 |  |  | 8 |  |  | — |  |  | (136 | ) |  | (105 | )
Reclassification adjustments, pretax | 5 |  | (1) | 32 |  | (2) | 47 |  | (3) | — |  |  | 84 |
Tax | (1 | ) |  | — |  |  | (7 | ) |  | — |  |  | (8 | )
Reclassification adjustments, net of taxes | 4 |  |  | 32 |  |  | 40 |  |  | — |  |  | 76 |
Other comprehensive income (loss), net of taxes | 27 |  |  | 40 |  |  | 40 |  |  | (136 | ) |  | (29 | )
Balance September 30, 2018, net of taxes | $ | 92 |  |  | $ | (124 | ) |  | $ | (3,025 | ) |  | $ | (2,094 | ) |  | $ | (5,151 | )
| Nine Months Ended September 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 | (520 | ) |  | 283 |  |  | 27 |  |  | 261 |  |  | 51 |
Tax | 182 |  |  | (23 | ) |  | (7 | ) |  | 162 |  |  | 314 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (338 | ) |  | 260 |  |  | 20 |  |  | 423 |  |  | 365 |
Reclassification adjustments, pretax | (159 | ) | (1) | (73 | ) | (2) | 86 |  | (3) | — |  |  | (146 | )
Tax | 56 |  |  | 26 |  |  | (20 | ) |  | — |  |  | 62 |
Reclassification adjustments, net of taxes | (103 | ) |  | (47 | ) |  | 66 |  |  | — |  |  | (84 | )
Other comprehensive income (loss), net of taxes | (441 | ) |  | 213 |  |  | 86 |  |  | 423 |  |  | 281 |
Balance September 30, 2017, net of taxes | $ | (103 | ) |  | $ | 210 |  |  | $ | (3,120 | ) |  | $ | (1,932 | ) |  | $ | (4,945 | )
Balance January 1, 2018, net of taxes | $ | (108 | ) |  | $ | (61 | ) |  | $ | (2,787 | ) |  | $ | (1,954 | ) |  | $ | (4,910 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | 113 |  |  | (125 | ) |  | (2 | ) |  | (129 | ) |  | (143 | )
Tax | (24 | ) |  | 1 |  |  | 4 |  |  | (111 | ) |  | (130 | )
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 89 |  |  | (124 | ) |  | 2 |  |  | (240 | ) |  | (273 | )
Reclassification adjustments, pretax | 169 |  | (1) | 68 |  | (2) | 128 |  | (3) | — |  |  | 365 |
Tax | (35 | ) |  | — |  |  | (24 | ) |  | — |  |  | (59 | )
Reclassification adjustments, net of taxes | 134 |  |  | 68 |  |  | 104 |  |  | — |  |  | 306 |
Other comprehensive income (loss), net of taxes | 223 |  |  | (56 | ) |  | 106 |  |  | (240 | ) |  | 33 |
Adoption of ASU 2018-02 (see Note 1) | (23 | ) |  | 1 |  |  | (344 | ) |  | 100 |  |  | (266 | )
Adoption of ASU 2016-01 (see Note 1) | — |  |  | (8 | ) |  | — |  |  | — |  |  | (8 | )
Balance September 30, 2018, net of taxes | $ | 92 |  |  | $ | (124 | ) |  | $ | (3,025 | ) |  | $ | (2,094 | ) |  | $ | (5,151 | )
(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 12).

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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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