Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Changes in Other Comprehensive income
Balances as of start of period	$ (2,784)
(Decrease) increase due to amounts reclassified into earnings		$ 2
Pension and other postretirement benefit gains	(8)	26
Balances as of end of period	(2,470)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Investment securities	3	(1)
Foreign currency translation adjustments	(191)	15
Cash Flow Hedges	(140)	(54)
Pension and other postretirement benefit losses	(9)	19
Total tax impact	(337)	(20)
Tax Benefit Recognized in the period	289
Accumulated Other Comprehensive Loss [Member]
Changes in Other Comprehensive income
Balances as of start of period	(2,784)	(2,534)
Net unrealized gains (losses)	6	4
(Decrease) increase due to amounts reclassified into earnings	0	(2)
Net translation loss of investments in foreign operations	545	96
Net losses gains related to hedges of investment in foreign operations	(229)	(92)
Pension and other postretirement benefit gains	(8)	26
Net change in accumulated other comprehensive income (loss)	314	32
Balances as of end of period	(2,470)	(2,502)
Net Unrealized Gains (Losses) on Investment Securities [Member]
Changes in Other Comprehensive income
Balances as of start of period	7	58
Net unrealized gains (losses)	6	4
(Decrease) increase due to amounts reclassified into earnings	0	(2)
Net translation loss of investments in foreign operations	0	0
Net losses gains related to hedges of investment in foreign operations	0	0
Pension and other postretirement benefit gains	0	0
Net change in accumulated other comprehensive income (loss)	6	2
Balances as of end of period	13	60
Foreign Currency Translation Adjustments [Member]
Changes in Other Comprehensive income
Balances as of start of period	(2,262)	(2,044)
Net unrealized gains (losses)	0	0
(Decrease) increase due to amounts reclassified into earnings	0	0
Net translation loss of investments in foreign operations	545	96
Net losses gains related to hedges of investment in foreign operations	(229)	(92)
Pension and other postretirement benefit gains	0	0
Net change in accumulated other comprehensive income (loss)	316	4
Balances as of end of period	(1,946)	(2,040)
Net Unrealized Pension and Other Postretirement Gains (Losses) [Member]
Changes in Other Comprehensive income
Balances as of start of period	(529)	(548)
Net unrealized gains (losses)	0	0
(Decrease) increase due to amounts reclassified into earnings	0	0
Net translation loss of investments in foreign operations	0	0
Net losses gains related to hedges of investment in foreign operations	0	0
Pension and other postretirement benefit gains	(8)	26
Net change in accumulated other comprehensive income (loss)	(8)	26
Balances as of end of period	$ (537)	$ (522)

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Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity, net of tax.

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Amount represents the net change in other comprehensive income (loss) during the period.

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This item represents the gains and losses, net of tax, associated with the Company's hedges of investment in foreign operations that has been included in a separate component of shareholders' equity during the period.

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The total net unrealized holding gain/loss that has been included as a separate component of other comprehensive income (loss) during the period.

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The total realized gain/ loss that has been included as a separate component of shareholders' equity during the period.

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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 after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity.

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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit), after 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 of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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