Pension And Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Combined net pension and postretirement cost increase (decrease)				$ (170)		$ (518)
Net supplemental retirement pension benefits costs				22	$ 29	63	$ 87
Net supplemental retirement pension benefits costs - interest cost				20	$ 27	$ 57	$ 82
DIRECTV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, General Information						DIRECTV maintains (1) a postretirement benefit plan for those retirees eligible to participate in health care and life insurance benefits generally until they reach age 65 and (2) an unfunded nonqualified pension plan for certain eligible employees.
Change in Accounting Method Accounted for as Change in Estimate [Member]
Defined Benefit Plan Disclosure [Line Items]
Combined net pension and postretirement cost increase (decrease)				(223)		$ (669)
Pension Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Contribution Date									Dec. 31, 2013
Required contribution to pension plans		$ 175				420		$ 560
Annualized cash distributions to be received by the trust/pension								175
Value of entity's noncash contribution to it's defined benefit plans				$ 8,838		8,838
Pension Benefit [Member] | December 2014 Lump Sum Payment Offer [Member]
Defined Benefit Plan Disclosure [Line Items]
Period offer presented to retirement-eligible employees to receive a one-time opportunity to elect a full lump sum payment of their accrued pension			Dec. 31, 2014
Approximate lump sum value of early retirement offer expected to be paid in next 12 months								$ 1,200
Special Termination Benefit						$ 150
Date at which retirees must accept lump sum payment offer	Mar. 31, 2015