Other Current Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Assets [Abstract]
Unrealized gains on derivative contracts	$ 624	$ 758
Deferred receivables consideration	540	513
Customer Omnibus Receivable	521	1,148
Financing Receivable, Net	373	352
Premiums Receivable, Net	648	584
Prepaid Expense, Current	268	406
Tax receivables	480	550
Other Receivables	478	288
Other current assets	451	687
Total other current assets	4,383	5,286
Financing Receivable, Allowance for Credit Losses	7	8
Interest on financing receivables	22	23	$ 23
Reinsurance Recoverables	$ 223	$ 272