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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
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, 2017, net of taxes | $ | 338 |  |  | $ | (3 | ) |  | $ | (3,206 | ) |  | $ | (2,355 | ) |  | $ | (5,226 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | (263 | ) |  | 87 |  |  | (4 | ) |  | 263 |  |  | 83 |
Tax | 92 |  |  | (7 | ) |  | 9 |  |  | 46 |  |  | 140 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (171 | ) |  | 80 |  |  | 5 |  |  | 309 |  |  | 223 |
Reclassification adjustments, pretax | (95 | ) | (1) | (57 | ) | (2) | 28 |  | (3) | — |  |  | (124 | )
Tax | 34 |  |  | 20 |  |  | (7 | ) |  | — |  |  | 47 |
Reclassification adjustments, net of taxes | (61 | ) |  | (37 | ) |  | 21 |  |  | — |  |  | (77 | )
Other comprehensive income (loss), net of taxes | (232 | ) |  | 43 |  |  | 26 |  |  | 309 |  |  | 146 |
Balance March 31, 2017, net of taxes | $ | 106 |  |  | $ | 40 |  |  | $ | (3,180 | ) |  | $ | (2,046 | ) |  | $ | (5,080 | )
Balance January 1, 2018, net of taxes | $ | (108 | ) |  | $ | (61 | ) |  | $ | (2,787 | ) |  | $ | (1,954 | ) |  | $ | (4,910 | )
Other comprehensive income (loss) before reclassification adjustments, pretax | (181 | ) |  | (112 | ) |  | (1 | ) |  | 319 |  |  | 25 |
Tax | 38 |  |  | — |  |  | 3 |  |  | (62 | ) |  | (21 | )
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (143 | ) |  | (112 | ) |  | 2 |  |  | 257 |  |  | 4 |
Reclassification adjustments, pretax | 92 |  | (1) | 12 |  | (2) | 41 |  | (3) | — |  |  | 145 |
Tax | (19 | ) |  | 1 |  |  | (7 | ) |  | — |  |  | (25 | )
Reclassification adjustments, net of taxes | 73 |  |  | 13 |  |  | 34 |  |  | — |  |  | 120 |
Other comprehensive income (loss), net of taxes | (70 | ) |  | (99 | ) |  | 36 |  |  | 257 |  |  | 124 |
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 March 31, 2018, net of taxes | $ | (201 | ) |  | $ | (167 | ) |  | $ | (3,095 | ) |  | $ | (1,597 | ) |  | $ | (5,060 | )
(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://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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