Basis of Presentation and Summary of Significant Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								9 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended		1 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Jan. 02, 2012 Change in estimates of capitalized labor Minimum	Dec. 31, 2013 Change in estimates of capitalized labor Minimum	Jan. 02, 2012 Change in estimates of capitalized labor Maximum	Dec. 31, 2013 Change in estimates of capitalized labor Maximum	Dec. 31, 2012 Change in estimates of economic lives and net salvage value	Jan. 30, 2014 Subsequent Event Change in estimates of economic lives and net salvage value
Change in accounting estimates
Labor capitalized as an asset												$ 40		$ 55
Operating expenses									(5,436)	(6,675)	(6,943)	40		55
Net Income (Loss) Attributable to Parent	236	218	246	264	241	212	178	218	543	964	849		25		34	32
Depreciation expense									$ (914)	$ (1,099)	$ (1,175)					$ (52)	$ (19)