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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2017
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, 2016, net of taxes | $ | 111 |  |  | $ | 167 |  |  | $ | (2,543 | ) |  | $ | (1,821 | ) |  | $ | (4,086 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | (69 | ) |  | (22 | ) |  | (177 | ) |  | 70 |  |  | (198 | )
Tax | 24 |  |  | (3 | ) |  | 21 |  |  | 12 |  |  | 54 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (45 | ) |  | (25 | ) |  | (156 | ) |  | 82 |  |  | (144 | )
Reclassification adjustments, pretax | (45 | ) | (1) | (5 | ) | (2) | 11 |  | (3) | — |  |  | (39 | )
Tax | 16 |  |  | — |  |  | 1 |  |  | — |  |  | 17 |
Reclassification adjustments, net of taxes | (29 | ) |  | (5 | ) |  | 12 |  |  | — |  |  | (22 | )
Other comprehensive income (loss), net of taxes | (74 | ) |  | (30 | ) |  | (144 | ) |  | 82 |  |  | (166 | )
Balance September 30, 2016, net of taxes | $ | 37 |  |  | $ | 137 |  |  | $ | (2,687 | ) |  | $ | (1,739 | ) |  | $ | (4,252 | )
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 | )
| Nine Months Ended September 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 | (311 | ) |  | 108 |  |  | (395 | ) |  | 424 |  |  | (174 | )
Tax | 109 |  |  | 8 |  |  | 88 |  |  | 23 |  |  | 228 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (202 | ) |  | 116 |  |  | (307 | ) |  | 447 |  |  | 54 |
Reclassification adjustments, pretax | (254 | ) | (1) | (26 | ) | (2) | 25 |  | (3) | — |  |  | (255 | )
Tax | 89 |  |  | 6 |  |  | 2 |  |  | — |  |  | 97 |
Reclassification adjustments, net of taxes | (165 | ) |  | (20 | ) |  | 27 |  |  | — |  |  | (158 | )
Other comprehensive income (loss), net of taxes | (367 | ) |  | 96 |  |  | (280 | ) |  | 447 |  |  | (104 | )
Balance September 30, 2016, net of taxes | $ | 37 |  |  | $ | 137 |  |  | $ | (2,687 | ) |  | $ | (1,739 | ) |  | $ | (4,252 | )
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 | )
(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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