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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | $ 32,766 | $ 39,712 | $ 34,569 | $ 40,308 |
Other comprehensive income (loss) before reclassification adjustments, pretax | (110) | 107 | (143) | 51 |
Tax | 5 | 43 | (130) | 314 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (105) | 150 | (273) | 365 |
Reclassification adjustments, pretax | 84 | (7) | 365 | (146) |
Tax | (8) | 6 | (59) | 62 |
Reclassification adjustments, net of taxes | 76 | (1) | 306 | (84) |
Other comprehensive income (loss), net of taxes | (29) | 149 | 33 | 281 |
Adoption of ASU 2018-02 (see Note 1) |  |  | (266) |  |
Equity, ending balance | 32,656 | 38,499 | 32,656 | 38,499 |
Derivatives |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | 65 | (37) | (108) | 338 |
Other comprehensive income (loss) before reclassification adjustments, pretax | 29 | (88) | 113 | (520) |
Tax | (6) | 31 | (24) | 182 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 23 | (57) | 89 | (338) |
Reclassification adjustments, pretax | 5 | (14) | 169 | (159) |
Tax | (1) | 5 | (35) | 56 |
Reclassification adjustments, net of taxes | 4 | (9) | 134 | (103) |
Other comprehensive income (loss), net of taxes | 27 | (66) | 223 | (441) |
Adoption of ASU 2018-02 (see Note 1) |  |  | (23) |  |
Adoption of ASU 2016-01 (see Note 1) |  |  |  |  | $ 0
Equity, ending balance | 92 | (103) | 92 | (103) |
Investments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | (164) | 75 | (61) | (3) |
Other comprehensive income (loss) before reclassification adjustments, pretax | 8 | 170 | (125) | 283 |
Tax | 0 | (19) | 1 | (23) |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 8 | 151 | (124) | 260 |
Reclassification adjustments, pretax | 32 | (24) | 68 | (73) |
Tax | 0 | 8 | 0 | 26 |
Reclassification adjustments, net of taxes | 32 | (16) | 68 | (47) |
Other comprehensive income (loss), net of taxes | 40 | 135 | (56) | 213 |
Adoption of ASU 2018-02 (see Note 1) |  |  | 1 |  |
Adoption of ASU 2016-01 (see Note 1) |  |  |  |  | (8)
Equity, ending balance | (124) | 210 | (124) | 210 |
Employee Benefit Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | (3,065) | (3,133) | (2,787) | (3,206) |
Other comprehensive income (loss) before reclassification adjustments, pretax | 0 | 2 | (2) | 27 |
Tax | 0 | (13) | 4 | (7) |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 0 | (11) | 2 | 20 |
Reclassification adjustments, pretax | 47 | 31 | 128 | 86 |
Tax | (7) | (7) | (24) | (20) |
Reclassification adjustments, net of taxes | 40 | 24 | 104 | 66 |
Other comprehensive income (loss), net of taxes | 40 | 13 | 106 | 86 |
Adoption of ASU 2018-02 (see Note 1) |  |  | (344) |  |
Adoption of ASU 2016-01 (see Note 1) |  |  |  |  | 0
Equity, ending balance | (3,025) | (3,120) | (3,025) | (3,120) |
Cumulative Translation Adjustment |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | (1,958) | (1,999) | (1,954) | (2,355) |
Other comprehensive income (loss) before reclassification adjustments, pretax | (147) | 23 | (129) | 261 |
Tax | 11 | 44 | (111) | 162 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (136) | 67 | (240) | 423 |
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 | (136) | 67 | (240) | 423 |
Adoption of ASU 2018-02 (see Note 1) |  |  | 100 |  |
Adoption of ASU 2016-01 (see Note 1) |  |  |  |  | 0
Equity, ending balance | (2,094) | (1,932) | (2,094) | (1,932) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | (5,122) | (5,094) | (4,910) | (5,226) |
Adoption of ASU 2016-01 (see Note 1) |  |  |  |  | $ (8)
Equity, ending balance | $ (5,151) | $ (4,945) | $ (5,151) | $ (4,945) |

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