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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2016, net of taxes | $ | 202 |  |  | $ | 104 |  |  | $ | (2,435 | ) |  | $ | (2,065 | ) |  | $ | (4,194 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | (75 | ) |  | 76 |  |  | (183 | ) |  | 255 |  |  | 73 |
Tax | 27 |  |  | (5 | ) |  | 68 |  |  | (11 | ) |  | 79 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (48 | ) |  | 71 |  |  | (115 | ) |  | 244 |  |  | 152 |
Reclassification adjustments, pretax | (66 | ) | (1) | (10 | ) | (2) | 7 |  | (3) | — |  |  | (69 | )
Tax | 23 |  |  | 2 |  |  | — |  |  | — |  |  | 25 |
Reclassification adjustments, net of taxes | (43 | ) |  | (8 | ) |  | 7 |  |  | — |  |  | (44 | )
Other comprehensive income (loss), net of taxes | (91 | ) |  | 63 |  |  | (108 | ) |  | 244 |  |  | 108 |
Balance June 30, 2016, net of taxes | $ | 111 |  |  | $ | 167 |  |  | $ | (2,543 | ) |  | $ | (1,821 | ) |  | $ | (4,086 | )
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 | )
| Six Months Ended June 30,
($ in millions) | Derivatives |  | Investments |  | Employee Benefit Plans |  | Cumulative Translation Adjustment |  | Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2016, net of taxes | $ | 404 |  |  | $ | 41 |  |  | $ | (2,407 | ) |  | $ | (2,186 | ) |  | $ | (4,148 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | (242 | ) |  | 130 |  |  | (218 | ) |  | 354 |  |  | 24 |
Tax | 85 |  |  | 11 |  |  | 67 |  |  | 11 |  |  | 174 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (157 | ) |  | 141 |  |  | (151 | ) |  | 365 |  |  | 198 |
Reclassification adjustments, pretax | (209 | ) | (1) | (21 | ) | (2) | 14 |  | (3) | — |  |  | (216 | )
Tax | 73 |  |  | 6 |  |  | 1 |  |  | — |  |  | 80 |
Reclassification adjustments, net of taxes | (136 | ) |  | (15 | ) |  | 15 |  |  | — |  |  | (136 | )
Other comprehensive income (loss), net of taxes | (293 | ) |  | 126 |  |  | (136 | ) |  | 365 |  |  | 62 |
Balance June 30, 2016, net of taxes | $ | 111 |  |  | $ | 167 |  |  | $ | (2,543 | ) |  | $ | (1,821 | ) |  | $ | (4,086 | )
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 | )
(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.
(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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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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