Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Other comprehensive income (loss)	$ 8	$ (240)	$ 68	$ (111)
Net Effect of Exchange Rate Fluctuations
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance at beginning of the period	(843)	(603)	(889)	(724)
Change before reclassifications	13	(253)	59	(132)
Other comprehensive income (loss)	13	(253)	59	(132)
Balance at end of the period	(830)	(856)	(830)	(856)
Change in Certain Derivative Instruments
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance at beginning of the period	(13)	(17)	(18)	(12)
Change before reclassifications	(4)	18	7	4
Amounts reclassified from accumulated other comprehensive income (loss)	(6)	(18)	(17)	(9)
Translation effect	1	(1)	3	(1)
Tax effect			3
Other comprehensive income (loss)	(9)	(1)	(4)	(6)
Balance at end of the period	(22)	(18)	(22)	(18)
Employee Benefit Plans
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance at beginning of the period	(1,055)	(1,084)	(1,061)	(1,091)
Change before reclassifications		(3)	(2)	(7)
Amounts reclassified from accumulated other comprehensive income (loss)	12	16	25	33
Translation effect	4	16	(1)	10
Other comprehensive income (loss)	16	29	22	36
Balance at end of the period	(1,039)	(1,055)	(1,039)	(1,055)
Accumulated Other Comprehensive Loss.
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance at beginning of the period	(1,911)	(1,704)	(1,968)	(1,827)
Change before reclassifications	9	(238)	64	(135)
Amounts reclassified from accumulated other comprehensive income (loss)	6	(2)	8	24
Translation effect	5	15	2	9
Tax effect			3
Other comprehensive income (loss)	20	(225)	77	(102)
Balance at end of the period	$ (1,891)	$ (1,929)	$ (1,891)	$ (1,929)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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