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Equity (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (7,525) | $ (8,334) | $ (7,619)
Other comprehensive (loss) income, net - Foreign Currency Translation | 620 | (1,089) | (1,502)
Amounts reclassified, pretax - Foreign Currency Translation | 10 | 0 | (42)
Tax reclassified - Foreign Currency Translation | 0 | 0 |
Other comprehensive (loss) income before reclassifications, net - Pension | (78) | 247 |
Amounts reclassified, pretax - Pension | 529 | 535 | 867
Tax reclassified - Pension | 214 | 198 |
Other comprehensive (loss) income before reclassifications, net - AFS Securities | 3 | 119 |
Amounts reclassified, pretax - AFS Securities | 566 | 94 | 54
Tax reclassified - AFS Securities | 215 | 35 |
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains | 264 | 54 |
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains | 39 | (171) | (234)
Tax reclassified - Unrealized Hedging (Losses) Gains | 9 | (48) |
Other comprehensive (loss) income before reclassifications, net | 885 | (1,116) |
Amounts reclassified, pretax | 86 | (612) |
Tax reclassified | 10 | (211) |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (2,950) | (3,480) | (2,438)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (4,652) | (5,045) | (5,135)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 5 | 353 | 293
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 | 72 | (162) | $ (339)
Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive (loss) income, net - Foreign Currency Translation | 540 | $ (1,042) |
Sale of investments in Watsco, Inc. [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified, pretax - AFS Securities | $ 500 |  |

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