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Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance |  |  | $ 40,308 | $ 44,767
Other comprehensive income (loss), net of taxes | $ 149 | $ (166) | 281 | (104)
Equity, ending balance | 38,499 | 43,957 | 38,499 | 43,957
Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance | (37) | 111 | 338 | 404
Other comprehensive income (loss) before reclassification adjustments, pretax | (88) | (69) | (520) | (311)
Tax | 31 | 24 | 182 | 109
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (57) | (45) | (338) | (202)
Reclassification adjustments, pretax | (14) | (45) | (159) | (254)
Tax | 5 | 16 | 56 | 89
Reclassification adjustments, net of taxes | (9) | (29) | (103) | (165)
Other comprehensive income (loss), net of taxes | (66) | (74) | (441) | (367)
Equity, ending balance | (103) | 37 | (103) | 37
Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance | 75 | 167 | (3) | 41
Other comprehensive income (loss) before reclassification adjustments, pretax | 170 | (22) | 283 | 108
Tax | (19) | (3) | (23) | 8
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 151 | (25) | 260 | 116
Reclassification adjustments, pretax | (24) | (5) | (73) | (26)
Tax | 8 | 0 | 26 | 6
Reclassification adjustments, net of taxes | (16) | (5) | (47) | (20)
Other comprehensive income (loss), net of taxes | 135 | (30) | 213 | 96
Equity, ending balance | 210 | 137 | 210 | 137
Employee Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance | (3,133) | (2,543) | (3,206) | (2,407)
Other comprehensive income (loss) before reclassification adjustments, pretax | 2 | (177) | 27 | (395)
Tax | (13) | 21 | (7) | 88
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (11) | (156) | 20 | (307)
Reclassification adjustments, pretax | 31 | 11 | 86 | 25
Tax | (7) | 1 | (20) | 2
Reclassification adjustments, net of taxes | 24 | 12 | 66 | 27
Other comprehensive income (loss), net of taxes | 13 | (144) | 86 | (280)
Equity, ending balance | (3,120) | (2,687) | (3,120) | (2,687)
Cumulative Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance | (1,999) | (1,821) | (2,355) | (2,186)
Other comprehensive income (loss) before reclassification adjustments, pretax | 23 | 70 | 261 | 424
Tax | 44 | 12 | 162 | 23
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 67 | 82 | 423 | 447
Reclassification adjustments, pretax | 0 | 0 | 0 | 0
Tax | 0 | 0 | 0 | 0
Reclassification adjustments, net of taxes | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of taxes | 67 | 82 | 423 | 447
Equity, ending balance | (1,932) | (1,739) | (1,932) | (1,739)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance | (5,094) | (4,086) | (5,226) | (4,148)
Other comprehensive income (loss) before reclassification adjustments, pretax | 107 | (198) | 51 | (174)
Tax | 43 | 54 | 314 | 228
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 150 | (144) | 365 | 54
Reclassification adjustments, pretax | (7) | (39) | (146) | (255)
Tax | 6 | 17 | 62 | 97
Reclassification adjustments, net of taxes | (1) | (22) | (84) | (158)
Other comprehensive income (loss), net of taxes | 149 | (166) | 281 | (104)
Equity, ending balance | $ (4,945) | $ (4,252) | $ (4,945) | $ (4,252)

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