SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 80	$ 67	$ 36	$ 28
Charged to Costs and Expenses	57	39	5
Charged to Other Accounts	(22)	6	8
Deductions	(22)	(14)	(5)
Balance at End of Year	80	67	36
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,857	1,367	859	$ 478
Charged to Costs and Expenses	627	344	272
Charged to Other Accounts	(137)	164	109
Deductions	0	0	0
Balance at End of Year	$ 1,857	$ 1,367	$ 859