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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 534	$ 877	$ 1,321	$ 1,534
Tax expense, entities included in effective tax rate calculation	621	$ 1,200	1,500	$ 2,000
Net deferred tax assets	31,800		31,800
U.S. [Member]
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforwards subject to expiration	8,700		8,700
Non-US [Member]
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforwards subject to expiration	1,300		1,300
Operating loss and tax credit carryforward deferred tax assets	4,900		4,900
Operating loss and tax credit carryforwards not subject to expiration	$ 3,600		$ 3,600

X

- Definition

The sum of the tax effects as of the balance sheet date of the amount of excesses of ordinary or capital tax deductions over income and excess tax credits in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax assets.

+ References

No definition available.

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- Definition

The sum of the tax effects as of the balance sheet date of the amount of excesses of ordinary or capital tax deductions over income and excess tax credits in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year not subject to expiration, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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The sum of the tax effects as of the balance sheet date of the amount of excesses of ordinary or capital tax deductions over income and excess tax credits in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year subject to expiration, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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Tax expense (benefit) from entities included in the effective tax rate calculation, prior to other adjustments (i.e., audit settlements).

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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