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Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance |  |  | $ 40,308 | $ 44,767
Other comprehensive income (loss), net of taxes | $ (14) | $ 108 | 132 | 62
Equity, ending balance | 39,712 | 43,446 | 39,712 | 43,446
Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance | 106 | 202 | 338 | 404
Other comprehensive income (loss) before reclassification adjustments, pretax | (169) | (75) | (432) | (242)
Tax | 59 | 27 | 151 | 85
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (110) | (48) | (281) | (157)
Reclassification adjustments, pretax | (50) | (66) | (145) | (209)
Tax | 17 | 23 | 51 | 73
Reclassification adjustments, net of taxes | (33) | (43) | (94) | (136)
Other comprehensive income (loss), net of taxes | (143) | (91) | (375) | (293)
Equity, ending balance | (37) | 111 | (37) | 111
Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance | 40 | 104 | (3) | 41
Other comprehensive income (loss) before reclassification adjustments, pretax | 26 | 76 | 113 | 130
Tax | 3 | (5) | (4) | 11
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 29 | 71 | 109 | 141
Reclassification adjustments, pretax | 8 | (10) | (49) | (21)
Tax | (2) | 2 | 18 | 6
Reclassification adjustments, net of taxes | 6 | (8) | (31) | (15)
Other comprehensive income (loss), net of taxes | 35 | 63 | 78 | 126
Equity, ending balance | 75 | 167 | 75 | 167
Employee Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance | (3,180) | (2,435) | (3,206) | (2,407)
Other comprehensive income (loss) before reclassification adjustments, pretax | 29 | (183) | 25 | (218)
Tax | (3) | 68 | 6 | 67
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 26 | (115) | 31 | (151)
Reclassification adjustments, pretax | 27 | 7 | 55 | 14
Tax | (6) | 0 | (13) | 1
Reclassification adjustments, net of taxes | 21 | 7 | 42 | 15
Other comprehensive income (loss), net of taxes | 47 | (108) | 73 | (136)
Equity, ending balance | (3,133) | (2,543) | (3,133) | (2,543)
Cumulative Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance | (2,046) | (2,065) | (2,355) | (2,186)
Other comprehensive income (loss) before reclassification adjustments, pretax | (25) | 255 | 238 | 354
Tax | 72 | (11) | 118 | 11
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 47 | 244 | 356 | 365
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 | 47 | 244 | 356 | 365
Equity, ending balance | (1,999) | (1,821) | (1,999) | (1,821)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Equity, beginning balance | (5,080) | (4,194) | (5,226) | (4,148)
Other comprehensive income (loss) before reclassification adjustments, pretax | (139) | 73 | (56) | 24
Tax | 131 | 79 | 271 | 174
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (8) | 152 | 215 | 198
Reclassification adjustments, pretax | (15) | (69) | (139) | (216)
Tax | 9 | 25 | 56 | 80
Reclassification adjustments, net of taxes | (6) | (44) | (83) | (136)
Other comprehensive income (loss), net of taxes | (14) | 108 | 132 | 62
Equity, ending balance | $ (5,094) | $ (4,086) | $ (5,094) | $ (4,086)

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