New Accounting Guidance (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Consolidated Statement of Cash Flows
Other current assets	$ (20)	$ (10)
Other assets		(11)
Accrued income taxes		(61)
Other liabilities		(98)
Net cash provided by operations	1,112	989
Proceeds from debt	347	1,090
Net cash used for financing activities	$ (783)	(639)
Scenario, Previously Reported
Consolidated Statement of Cash Flows
Other current assets		43
Other assets		(65)
Accrued income taxes		(68)
Other liabilities		(99)
Net cash provided by operations		980
Proceeds from debt		1,099
Net cash used for financing activities		(630)
Accounting Standards Update 2015-17 | Restatement Adjustment
Consolidated Statement of Cash Flows
Other current assets		(54)
Other assets		46
Accrued income taxes		7
Other liabilities		1
Net cash provided by operations		0
Proceeds from debt		0
Net cash used for financing activities		0
Accounting Standards Update 2015-03 | Restatement Adjustment
Consolidated Statement of Cash Flows
Other current assets		1
Other assets		8
Accrued income taxes		0
Other liabilities		0
Net cash provided by operations		9
Proceeds from debt		(9)
Net cash used for financing activities		$ (9)