Other Current Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Other Assets [Abstract]
Derivative Asset	$ 443		$ 443		$ 624
Deferred receivables consideration	399		399		540
Receivables from Customers	474		474		521
Financing Receivable, Net	407		407		373
Premiums Receivable, Net	137		137		648
Prepaid Expense, Current	248		248		268
Tax receivables	423		423		480
Other Receivables	374		374		478
Other current assets	179		179		451
Total other current assets	3,084		3,084		4,383
Financing Receivable, Allowance for Credit Losses	6		6		7
Interest on financing receivables	6	$ 5	18	$ 17
Reinsurance Recoverables	$ 75		$ 75		$ 223