Debt - Interest Income/Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Interest Expense, Debt		$ 365	$ 400	$ 435
Interest Expense	[1],[2]	353	377	403
Interest Income	[3]	$ 354	$ 397	$ 494

[1] Asset information on a segment basis is not disclosed as this information is not separately identified and internally reported to our Chief Operating Decision Maker (CODM).

[2] Includes Equipment financing interest expense, as well as non-financing interest expense included in Other expenses, net in the Consolidated Statements of Income.

[3] Includes Finance income, as well as other interest income that is included in Other expenses, net in the Consolidated Statements of Income.