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Summary of Changes in AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (10,149) | $ (9,333)
Other comprehensive (loss) income, net - Foreign Currency Translation | 266 | (516)
Amounts reclassified, pretax - Foreign Currency Translation | (2) | 2
Tax (benefit) expense reclassified - Foreign Currency Translation | 43 | 4
Other comprehensive (loss) income before reclassifications, net - Pension | (584) | (1,736)
Amounts reclassified, pretax - Pension | 228 | 344
Tax (benefit) expense reclassified - Pension | (97) | (326)
Other comprehensive (loss) income before reclassifications, net - AFS Securities | 0 | 0
Amounts reclassified, pretax - AFS Securities | 0 | 0
Tax (benefit) expense reclassified - AFS Securities | 0 | 0
Other Comprehensive Income (Loss), ASU 2016-01 adoption impact on Securities Arising During Period | 0 | (5)
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains | (33) | (307)
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains | (51) | 16
Tax (benefit) expense reclassified - Unrealized Hedging (Losses) Gains | 11 | (78)
Other comprehensive (loss) income before reclassifications, net | (337) | (2,529)
Amounts reclassified, pretax | (223) | (326)
Tax (benefit) expense reclassified | (43) | (400)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract] |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | 170 |
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 2018-02 adoption impact on Securities Arising During Period | 0 |
Pension Plan [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amounts reclassified, pretax - Pension | 17 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract] |  |
Net settlement and curtailment gain (loss) | 54 | (1)
UNITED STATES | Pension Plan [Member] |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract] |  |
Net settlement and curtailment gain (loss) | 98 |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (3,211) | (3,442)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (6,772) | (5,718)
Accumulated Net Unrealized Gain (Loss) on Available-for-Sale Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 0 | 0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (166) | (173)
Parent [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive (loss) income, net - Foreign Currency Translation | $ (280) | $ 486

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