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Equity, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Changes in Accumulated Other Comprehensive Loss, By Component, Net of Tax |  |
Beginning balance, accumulated other comprehensive loss, net of tax | $ 21,667 |
Other comprehensive income before reclassifications | 153 | $ 42
Amounts reclassified from accumulated other comprehensive loss | 2 | 6
Other comprehensive income | 155 | 48
Reclassification of stranded income tax effects of Tax Reform to retained earnings |  | 0
Ending balance, accumulated other comprehensive loss, net of tax | 21,309 |
Accumulated Other Comprehensive Loss [Member] |  |
Changes in Accumulated Other Comprehensive Loss, By Component, Net of Tax |  |
Beginning balance, accumulated other comprehensive loss, net of tax | (1,507) | (940)
Reclassification of stranded income tax effects of Tax Reform to retained earnings | 0 | (91)
Ending balance, accumulated other comprehensive loss, net of tax | (1,352) | (983)
Foreign Currency Translation Adjustment [Member] |  |
Changes in Accumulated Other Comprehensive Loss, By Component, Net of Tax |  |
Beginning balance, accumulated other comprehensive loss, net of tax | (1,022) | (507)
Other comprehensive income before reclassifications | 153 | 42
Amounts reclassified from accumulated other comprehensive loss | 0 | 0
Other comprehensive income | 153 | 42
Reclassification of stranded income tax effects of Tax Reform to retained earnings | 0 | 0
Ending balance, accumulated other comprehensive loss, net of tax | (869) | (465)
Defined Benefit Plans Items [Member] |  |
Changes in Accumulated Other Comprehensive Loss, By Component, Net of Tax |  |
Beginning balance, accumulated other comprehensive loss, net of tax | (485) | (433)
Other comprehensive income before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | 2 | 6
Other comprehensive income | 2 | 6
Reclassification of stranded income tax effects of Tax Reform to retained earnings | 0 | (91)
Ending balance, accumulated other comprehensive loss, net of tax | $ (483) | $ (518)

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