Debt and Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2015

Long-term Debt, Unclassified [Abstract]

Maturities Of Long-Term Debt Disclosures

			2015		2014
Senior unsecured notes:
	Rate	Due
	3.000%	1/15/2015	$	—	$	500
	2.000%	9/30/2016	750		750
	1.300%	4/1/2018	599		598
	4.375%	1/15/2020	498		498
	3.375%	5/15/2024	610		605
	3.375%	11/1/2025	750		—
	4.100%	4/1/2043	395		395
	4.375%	5/15/2044	398		398
Commercial paper			—		200
Other			22		29
	Total debt		$	4,022	$	3,973
	Less current maturities		769		727
	Total long-term debt		$	3,253	$	3,246