Indebtedness (Debt Offerings During Current Period) (Details) (Foreign Currency Obligations [Member]) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 One Point Eight Seven Five Percent Euro Notes Due March 2021 [Member] USD ($)		Mar. 31, 2014 One Point Eight Seven Five Percent Euro Notes Due March 2021 [Member] EUR (€)		Mar. 31, 2014 Two Point Eight Seven Five Percent Euro Note Due March 2026 [Member] USD ($)		Mar. 31, 2014 Two Point Eight Seven Five Percent Euro Note Due March 2026 [Member] EUR (€)
Debt Instrument [Line Items]
Face Value	$ 1,029		€ 750		$ 1,372		€ 1,000
Interest Rate	1.875%	[1]	1.875%	[1]	2.875%	[1]	2.875%	[1]
Debt Instrument, Issuance Date	Mar. 01, 2014	[1]	Mar. 01, 2014	[1]	Mar. 01, 2014	[1]	Mar. 01, 2014	[1]
Debt Instrument, Maturity Date	Mar. 01, 2021	[1]	Mar. 01, 2021	[1]	Mar. 01, 2026	[1]	Mar. 01, 2026	[1]

[1] Interest on these notes is payable annually in arrears beginning in March 2015. U.S. dollar equivalents for foreign currency notes were calculated based on exchange rates on the date of issuance.