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Accumulated Other Comprehensive Loss (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (10,819) | $ (7,723) | $ (10,819) | $ (7,723) | $ (9,892) | $ (9,333) | $ (7,684) | $ (7,525)
Amounts reclassified, pretax - Foreign Currency Translation | 0 | 0 | 0 | (3) |  |  |  |
Tax (benefit) expense - Foreign Currency Translation | (56) | 4 | (55) | 60 |  |  |  |
Other comprehensive (loss) income before reclassifications, net - Pension | (420) | (17) | (434) | 9 |  |  |  |
Amounts reclassified, pretax - Pension | (41) | 86 | 46 | 262 |  |  |  |
Tax (benefit) expense - Pension | 114 | (15) | 98 | (64) |  |  |  |
Other comprehensive (loss) income before reclassifications, net - AFS Securities |  | 0 |  | 0 |  |  |  |
Amounts reclassified, pretax - AFS Securities |  | 0 |  | 0 |  |  |  |
Tax (benefit) expense - AFS Securities |  | 0 |  | 0 |  |  |  |
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains | (153) | 95 | (125) | (105) |  |  |  |
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains | 20 | 2 | 40 | (26) |  |  |  |
Tax (benefit) expense - Unrealized Hedging (Losses) Gains | 26 | (28) | 11 | (28) |  |  |  |
Other comprehensive (loss) income before reclassifications, net | (990) | (88) | (881) | (450) |  |  |  |
Amounts reclassified, pretax | (21) | 88 | 86 | 233 |  |  |  |
Tax (benefit) expense | 84 | (39) | 54 | 24 |  |  |  |
Other Comprehensive Income (Loss), ASU 2016-01 adoption impact on foreign currency translation Arising During Period |  |  |  | 0 |  |  |  |
Other Comprehensive Income (Loss), ASU 2018-02 adoption impact on foreign currency translation Arising During Period |  |  | (8) |  |  |  |  |
Other Comprehensive Income (Loss), ASU 2018-02 adoption impact on Defined Benefit Plan Arising During Period |  |  | (737) |  |  |  |  |
Other Comprehensive Income (Loss), ASU 2018-02 adoption impact on Derivatives Arising During Period |  |  | 0 |  |  |  |  |
Reclassification from OCI, current period, ASU 2018-02 adoption impact |  |  | (745) |  |  |  |  |
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 Securities Arising During Period | 0 | 0 | 0 | (5) |  |  |  |
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 | (3,827) | (3,247) | (3,827) | (3,247) | (3,354) | (3,442) | (3,085) | (2,950)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation | (417) | (166) | (322) | (354) |  |  |  |
Defined Benefit Pension and Post-retirement Plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (6,745) | (4,445) | (6,745) | (4,445) | (6,398) | (5,718) | (4,499) | (4,652)
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  | 0 |  | 0 |  |  | 0 | 5
Unrealized hedging (losses) gains |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (247) | $ (31) | $ (247) | $ (31) | $ (140) | $ (173) | $ (100) | $ 72

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