Long-Term Debt (Narrative) (Details) (USD $)	6 Months Ended	1 Months Ended		1 Months Ended		1 Months Ended
	Aug. 03, 2014	Jun. 30, 2014 2.00% Senior Notes due June 15, 2019 [Member]	Jun. 12, 2014 2.00% Senior Notes due June 15, 2019 [Member]	Jun. 30, 2014 4.40% Senior Notes due March 15, 2045 [Member]	Jun. 12, 2014 4.40% Senior Notes due March 15, 2045 [Member]	Jun. 30, 2014 June 2014 Issuance [Member]	Jun. 12, 2014 June 2014 Issuance [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 1,000,000,000		$ 1,000,000,000
Debt Instrument, Interest Rate, Stated Percentage			2.00%		4.40%
Debt Instrument, Maturity Date		Jun. 15, 2019		Mar. 15, 2045
Debt Discount			4,000,000		15,000,000		19,000,000
Debt Issuance Costs						$ 14,000,000
Debt Instrument, Frequency of Periodic Payment		semi-annually on June 15 and December 15		semi-annually on March 15 and September 15
Long-Term Debt, Redemption Price	100.00%
Debt Instrument, Change of Control, Redemption Price, Percent	101.00%