Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt [Abstract]

Long-term Debt

	December 31,
	2017		2016
Current portion of long-term debt	$	379	$	256
Long-term debt
Debentures, 1.45%, due 2017			$	250
Debentures, 1.5%, due 2018	$	375		374
Debentures, 6.625%, due 2019		245		245
Debentures, 4.25%, due 2020		288		290
Debentures, 8.875%, due 2021		66		67
Debentures, 2.9%, due 2022		373		372
Debentures, 3.70%, due 2023		249		248
Medium-term notes, average rate 7.66%, due through 2023		45		45
Debentures, 7.00%, due 2024		99		99
Yen-denominated debentures, .698%, due 2024		185
Yen-denominated debentures, .992%, due 2027		414
Debentures, 6.85%, due 2029		166		167
Debentures, callable, 7.25%, due 2036		248		248
Debentures, 4.70%, due 2037		248		248
Yen-denominated debentures, 1.583%, due 2037		85
Debentures, 5.75%, due 2040		397		395
Debentures, 4.75%, due 2042		496		495
Debentures, 4.375%, due 2057		743
Other, average rate 5.05%, due through 2042		406		359
Total long-term debt		5,128		3,902
Less current portion of long-term debt		379		256
Long-term debt	$	4,749	$	3,646

Debt Maturities

2018		2019		2020		2021		2022		Thereafter
$	379	$	254	$	305	$	67	$	381	$	3,769