New Accounting Guidance New Accounting Guidance (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Consolidated Statement of Cash Flows
Other current assets	$ (34)	$ (26)
Other assets		8
Accrued income taxes		(30)
Other liabilities		(79)
Net cash used for operations	(581)	(523)
Proceeds from debt	347	493
Net cash provided by financing activities	$ 245	64
Scenario, Previously Reported
Consolidated Statement of Cash Flows
Other current assets		28
Other assets		(43)
Accrued income taxes		(37)
Other liabilities		(82)
Net cash used for operations		(530)
Proceeds from debt		500
Net cash provided by financing activities		71
Accounting Standards Update 2015-03 | Restatement Adjustment
Consolidated Statement of Cash Flows
Other current assets		1
Other assets		6
Accrued income taxes		0
Other liabilities		0
Net cash used for operations		7
Proceeds from debt		(7)
Net cash provided by financing activities		(7)
Accounting Standards Update 2015-17 | Restatement Adjustment
Consolidated Statement of Cash Flows
Other current assets		(55)
Other assets		45
Accrued income taxes		7
Other liabilities		3
Net cash used for operations		0
Proceeds from debt		0
Net cash provided by financing activities		$ 0