Accounts Receivable Facility (Details) - Accounts Receivable [Member] - USD ($) $ in Millions	1 Months Ended			3 Months Ended
	Nov. 30, 2015	Oct. 31, 2015	Sep. 30, 2015	Dec. 31, 2015	Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Maximum Funding Limit	$ 4,300
Receivables Facility, maximum borrowing capacity				$ 2,000
Receivables Facility, Amount of Funds Available				$ 778
Receivables Facility, maximum amount available based on receivables sold to investors, percent				50.00%
Accounts Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Receivables Facility, Amount of Funds Available				$ 193
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding			$ 1,900		$ 1,800
Cash received for sale of receivables under receivables facility		$ 300	400		500
Receivable from Conduits			1,500		1,300
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds			$ 1,400	1,100	$ 1,200
Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Receivables Facility, Amount of Funds Available				29
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding		1,200
Cash received for sale of receivables under receivables facility	$ 400	100
Cash Flows Between Transferor and Transferee, Proceeds from Collections Reinvested in Revolving Period Transfers				150
Receivable from Conduits		1,100
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds		$ 1,000		491
Future lease receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
Receivables Facility, Amount of Funds Available				$ 556