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Shareowners' Equity and Noncontrolling Interest (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (7,723) | $ (7,327) | $ (7,723) | $ (7,327) | $ (7,684) | $ (7,525) | $ (7,964) | $ (8,334)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation | (185) | 514 | (378) | 909 |  |  |  |
Amounts reclassified, pretax - Foreign Currency Translation | 0 | 3 | 3 | 3 |  |  |  |
Tax (benefit) expense reclassified - Foreign Currency Translation | 4 | 0 | 60 | 0 |  |  |  |
Other comprehensive (loss) income before reclassifications, net - Pension | (17) | (37) | 9 | (39) |  |  |  |
Amounts reclassified, pretax - Pension | 86 | 132 | 262 | 395 |  |  |  |
Tax (benefit) expense reclassified - Pension | (15) | (66) | (64) | (164) |  |  |  |
Other comprehensive (loss) income before reclassifications, net - AFS Securities | 0 | 12 | 0 | 11 |  |  |  |
Amounts reclassified, pretax - AFS Securities | 0 | 138 | 0 | 545 |  |  |  |
Tax (benefit) expense reclassified - AFS Securities | 0 | 50 | 0 | 205 |  |  |  |
Other Comprehensive Income (Loss), ASU 2016-01 adoption impact on Securities Arising During Period | 0 | 0 | (5) | 0 |  |  |  |
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains | 95 | 232 | (105) | 332 |  |  |  |
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains | (2) | 24 | 26 | 14 |  |  |  |
Tax (benefit) expense reclassified - Unrealized Hedging (Losses) Gains | (28) | 5 | 28 | 3 |  |  |  |
Other comprehensive (loss) income before reclassifications, net | (88) | 681 | (450) | 1,130 |  |  |  |
Amounts reclassified, pretax | (88) | 33 | (233) | 167 |  |  |  |
Tax (benefit) expense reclassified | (39) | (11) | 24 | 44 |  |  |  |
Other Comprehensive Income (Loss), ASU 2016-01 adoption impact on foreign currency translation Arising During Period |  |  | 0 |  |  |  |  |
Other Comprehensive Income (Loss), ASU 2016-01 adoption impact on Defined Benefit Plan Arising During Period |  |  | 0 |  |  |  |  |
Other Comprehensive Income (Loss), ASU 2016-01 adoption impact on Derivatives Arising During Period |  |  | 0 |  |  |  |  |
Reclassification from OCI, current period, ASU 2016-01 adoption impact |  |  | (5) |  |  |  |  |
Foreign Currency Translation |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (3,247) | (2,657) | (3,247) | (2,657) | (3,085) | (2,950) | (3,128) | (3,480)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation | (166) | 474 | (354) | 826 |  |  |  |
Defined Benefit Pension and Post-retirement Plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (4,445) | (4,853) | (4,445) | (4,853) | (4,499) | (4,652) | (4,882) | (5,045)
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 0 | 24 | 0 | 24 | 0 | 5 | 100 | 353
Sales of significant investments in AFS securities [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains |  | 500 |  |  |  |  |  |
Unrealized hedging (losses) gains |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (31) | $ 159 | $ (31) | $ 159 | $ (100) | $ 72 | $ (54) | $ (162)

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