Indebtedness (Narrative) (Details) (USD $)				6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 364-day revolving credit, expiring February 10, 2015 [Member]	Jun. 30, 2014 Multi-year revolving credit, expiring February 28, 2019 [Member]	Feb. 28, 2014 Multi-year revolving credit, expiring March 31, 2015 [Member]
Line of Credit Facility [Line Items]
Short-term borrowings, carrying value	$ 1,941,000,000	$ 2,400,000,000
Line of Credit Facility, Maximum Borrowing Capacity	8,000,000,000		2,000,000,000	2,500,000,000
Line of Credit Facility, Initiation Date				Feb. 28, 2014
Credit Facilities No Longer Available					2,500,000,000
Line of Credit Facility, Amount Outstanding	$ 0