Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Foreign income before taxes		$ 704	$ 385	$ 524
Liability for uncertain tax positions, noncurrent		1,100
Unrecognized tax benefits that would impact effective tax rate		592
Unrecognized tax benefits, interest on income taxes accrued		510	452
Change In Income Tax Expense Related To Effectively Settled Uncertain Tax Positions	$ 759
Income Tax Effects Allocated Directly to Equity, Other		311	299	$ 244
Franchise Rights [Member]
Net deferred tax liability, franchise rights		23,000
Uncertain Tax Positions Indemnified By GE [Member]
Liability for uncertain tax positions, noncurrent		220
Unrecognized tax benefits, interest on income taxes accrued		49	$ 44
Other Comprehensive Income (Loss) [Member]
Income Tax Effects Allocated Directly to Equity, Other		28
Domestic Tax Authority
Operating loss carryforwards		$ 135
Operating loss carryforwards expiration dates		Dec. 31, 2035
Foreign Tax Authority
Operating loss carryforwards		$ 700
Operating loss carryforwards expiration dates		Dec. 31, 2025
Other Acquisitions [Member]
Business Acquisition Purchase Price Allocation Deferred Income Taxes Asset Liability Net1		$ 132