Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Number of days past due to reach non accrual status	90 days
Debt issuance costs included in other assets	$ 432	$ 483
Current deferred income taxes assets	1,175	1,143
Noncurrent deferred income tax liabilities	5,663	6,088
Accounting Standards Update 2015-03 [Member]
Property, Plant and Equipment [Line Items]
Debt issuance costs included in other assets	72	$ 83
Accounting Standards Update 2015-17 [Member]
Property, Plant and Equipment [Line Items]
Current deferred income taxes assets	1,200
Noncurrent deferred income tax liabilities	1,000
Noncurrent deferred income tax assets	$ 200
Maximum [Member]
Property, Plant and Equipment [Line Items]
Definite-lived intangible assets useful life maximum, years	25 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment	25 years
Maximum [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment	50 years