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Shareholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance |  | $ 15,770 | $ 17,960 |  | $ 18,863 |
Other comprehensive income | [1] | (256) | 757 | [2] | (175) | [3]
Amounts reclassified from accumulated other comprehensive income (loss) | [1],[4] | 93 | 42 | [5] | 62 | [5]
Equity method affiliates | [1] | (5) | 35 | [6] | 248 | [6],[7]
Net current-period other comprehensive income | [1] | (168) | 834 |  | 135 |
Balance |  | 13,886 | 15,770 |  | 17,960 |
Other Comprehensive Income, Tax |  | 64 | 97 |  | 52 |
Other Comprehensive Income (Loss), Equity Method Investments, Tax |  |  | 20 |  |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Balance | [1] | (529) | (1,275) |  | (1,171) |
Other comprehensive income | [1] | (180) | 711 | [2] | (89) | [3]
Equity method affiliates | [1] | (5) | 35 | [6] | (15) | [6],[7]
Net current-period other comprehensive income | [1] | (185) | 746 |  | (104) |
Balance | [1] | (714) | (529) |  | (1,275) |
Other Comprehensive Income, Tax |  | 34 | 4 |  | 36 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Balance | [1] | (317) | (347) |  | (588) |
Other comprehensive income | [1] | (84) | 13 | [2] | (63) | [3]
Amounts reclassified from accumulated other comprehensive income (loss) | [1],[4] | 103 | 17 | [5] | 40 | [5]
Equity method affiliates | [1],[6],[7] |  |  |  | 264 |
Net current-period other comprehensive income | [1] | 19 | 30 |  | 241 |
Balance | [1] | (298) | (317) |  | (347) |
Other Comprehensive Income, Tax |  | (3) | 88 |  | 12 |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |
Balance | [1] | (3) | (17) |  | (14) |
Other comprehensive income | [1] | (1) |  |  | (2) | [3]
Amounts reclassified from accumulated other comprehensive income (loss) | [1],[5] |  | 14 |  |  |
Equity method affiliates | [1],[6],[7] |  |  |  | (1) |
Net current-period other comprehensive income | [1] | (1) | 14 |  | (3) |
Balance | [1] | (4) | (3) |  | (17) |
Other Comprehensive Income, Tax |  |  |  |  | 1 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |
Balance | [1] | 7 | (37) |  | (38) |
Other comprehensive income | [1] | 9 | 33 | [2] | (21) | [3]
Amounts reclassified from accumulated other comprehensive income (loss) | [1] | (10) | 11 | [5] | 22 | [5]
Net current-period other comprehensive income | [1] | (1) | 44 |  | 1 |
Balance | [1] | 6 | 7 |  | (37) |
Other Comprehensive Income, Tax |  | 33 | 5 |  | 3 |
AOCI Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Balance | [1] | (842) | (1,676) |  | (1,811) |
Balance | [1] | $ (1,010) | $ (842) |  | $ (1,676) |
[1] | All amounts are after tax. Amounts in parentheses indicate debits to accumulated other comprehensive income.
[2] | Amounts are net of total tax benefit of $64 million, including $34 million related to the foreign currency translation adjustments, $33 million related to the retirement plans component and $(3) million related to the hedges component.
[3] | Amounts are net of total tax expense of $97 million, including $88 million related to the foreign currency translation adjustments, $5 million related to the hedges component and $4 million related to the retirement plans component.
[4] | Amounts in parentheses indicate debits to the statement of income.
[5] | Tax effects of reclassifications are disclosed separately in this Note 15.
[6] | Tax effects related to equity method affiliates are not significant in the reported periods except for the tax expense of $20 million related to the pension component in 2016.
[7] | Most of the changes in equity method affiliate accumulated other comprehensive income components in 2016 relate to disposal transactions with amounts reclassified to the income statement.

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