Revisions - Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income taxes receivable, net	$ 287	$ 591
Assets, Current	88,103	79,978
Assets	144,281	130,426
Income taxes payable, non-current	3,596	3,340
Retained earnings	85,969	75,066
Stockholders' Equity Attributable to Parent	116,241	103,860
Liabilities and Equity	$ 144,281	130,426
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income taxes receivable, net		1,298
Assets, Current		80,685
Assets		131,133
Income taxes payable, non-current		3,407
Retained earnings		75,706
Stockholders' Equity Attributable to Parent		104,500
Liabilities and Equity		131,133
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income taxes receivable, net		(707)
Assets, Current		(707)
Assets		(707)
Income taxes payable, non-current		(67)
Retained earnings		(640)
Stockholders' Equity Attributable to Parent		(640)
Liabilities and Equity		$ (707)