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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | $ 27,670 | $ 33,901 | $ 26,882 | $ 34,569 |
Other comprehensive income (loss) before reclassification adjustments, pretax | 40 | (54) | 258 | (33) |
Tax | 4 | (115) | 7 | (135) |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 44 | (169) | 265 | (168) |
Reclassification adjustments, pretax | (73) | 132 | (101) | 281 |
Tax | 13 | (25) | 19 | (51) |
Reclassification adjustments, net of taxes | (60) | 107 | (82) | 230 |
Other comprehensive income (loss), net of taxes | (16) | (62) | 183 | 62 |
Adoption of ASU 2018-02 |  |  |  | (266) |
Adoption of ASU 2016-01 |  |  |  |  | $ (8)
Equity, ending balance | 27,737 | 32,766 | 27,737 | 32,766 |
Derivatives |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | 118 | (201) | 166 | (108) |
Other comprehensive income (loss) before reclassification adjustments, pretax | 10 | 265 | (3) | 84 |
Tax | (2) | (56) | 1 | (18) |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 8 | 209 | (2) | 66 |
Reclassification adjustments, pretax | (76) | 72 | (124) | 164 |
Tax | 16 | (15) | 26 | (34) |
Reclassification adjustments, net of taxes | (60) | 57 | (98) | 130 |
Other comprehensive income (loss), net of taxes | (52) | 266 | (100) | 196 |
Adoption of ASU 2018-02 |  |  |  | (23) |
Adoption of ASU 2016-01 |  |  |  |  | 0
Equity, ending balance | 66 | 65 | 66 | 65 |
Investments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | 4 | (167) | (78) | (61) |
Other comprehensive income (loss) before reclassification adjustments, pretax | 55 | (17) | 131 | (133) |
Tax | 0 | 0 | 0 | 1 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 55 | (17) | 131 | (132) |
Reclassification adjustments, pretax | (11) | 20 | (5) | 36 |
Tax | 0 | 0 | 0 | 0 |
Reclassification adjustments, net of taxes | (11) | 20 | (5) | 36 |
Other comprehensive income (loss), net of taxes | 44 | 3 | 126 | (96) |
Adoption of ASU 2018-02 |  |  |  | 1 |
Adoption of ASU 2016-01 |  |  |  |  | (8)
Equity, ending balance | 48 | (164) | 48 | (164) |
Employee Benefit Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | (3,541) | (3,095) | (3,556) | (2,787) |
Other comprehensive income (loss) before reclassification adjustments, pretax | 0 | (1) | (1) | (2) |
Tax | 0 | 1 | 6 | 4 |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | 0 | 0 | 5 | 2 |
Reclassification adjustments, pretax | 14 | 40 | 28 | 81 |
Tax | (3) | (10) | (7) | (17) |
Reclassification adjustments, net of taxes | 11 | 30 | 21 | 64 |
Other comprehensive income (loss), net of taxes | 11 | 30 | 26 | 66 |
Adoption of ASU 2018-02 |  |  |  | (344) |
Adoption of ASU 2016-01 |  |  |  |  | 0
Equity, ending balance | (3,530) | (3,065) | (3,530) | (3,065) |
Cumulative Translation Adjustment |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | (1,927) | (1,597) | (2,077) | (1,954) |
Other comprehensive income (loss) before reclassification adjustments, pretax | (25) | (301) | 131 | 18 |
Tax | 6 | (60) | 0 | (122) |
Other comprehensive income (loss) before reclassification adjustments, net of taxes | (19) | (361) | 131 | (104) |
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 | (19) | (361) | 131 | (104) |
Adoption of ASU 2018-02 |  |  |  | 100 |
Adoption of ASU 2016-01 |  |  |  |  | $ 0
Equity, ending balance | (1,946) | (1,958) | (1,946) | (1,958) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Equity, beginning balance | (5,346) | (5,060) | (5,545) | (4,910) |
Equity, ending balance | $ (5,362) | $ (5,122) | $ (5,362) | $ (5,122) |

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