Other Current Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Other Assets [Abstract]
Derivative Asset	$ 664		$ 624
Deferred receivables consideration	298		540
Receivables from Customers	474		521
Financing Receivable, Net	363		373
Premiums Receivable, Net	617		648
Prepaid Expense, Current	214		268
Tax receivables	401		480
Other Receivables	589		478
Other current assets	321		451
Total other current assets	3,941		4,383
Financing Receivable, Allowance for Credit Losses	7		7
Interest on financing receivables	7	$ 8
Reinsurance Recoverables	$ 259		$ 223