Other Current Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Other Assets [Abstract]
Derivative Asset	$ 535		$ 535		$ 624
Deferred receivables consideration	353		353		540
Receivables from Customers	430		430		521
Financing Receivable, Net	351		351		373
Premiums Receivable, Net	52		52		648
Prepaid Expense, Current	285		285		268
Tax receivables	347		347		480
Other Receivables	370		370		478
Other current assets	175		175		451
Total other current assets	2,898		2,898		4,383
Financing Receivable, Allowance for Credit Losses	7		7		7
Interest on financing receivables	5	$ 4	12	$ 12
Reinsurance Recoverables	$ 58		$ 58		$ 223