LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2016

LONG-TERM DEBT

Long-term debt

Balance at December 31, (in millions)	2016			2015
1.50% senior notes due 2018	$	500		$	500
9.25% senior debentures due 2019	116			116
4.10% senior notes due 2021	1,249			1,249
3.125% senior notes due 2022	813			813
2.60% senior notes due 2022	400			—
2.70% senior notes due 2023	1,191			1,191
8.75% medium-term notes due 2023	22			22
3.50% senior notes due 2025	750			750
3.40% senior notes due 2026	1,150			—
3.00% senior notes due 2027	750			—
7.20% senior debentures due 2028	82			82
8.45% senior debentures due 2029	116			116
4.625% senior notes due 2045	750			750
4.40% senior notes due 2046	1,200			—
4.10% senior notes due 2047	750			—
2.50% senior notes due 2016	—			700
4.125% senior notes due 2016	—			750
1.75% senior notes due 2017	—			1,250
Variable rate bonds due 2030 (0.9% and 0.15% as of December 31, 2016 and 2015, respectively )	68			68
	9,907			8,357
Less:
Unamortized discount, net	(36		)	(24		)
Debt issuance costs	(52		)	(28		)
Current maturities	—			(1,450		)
Total	$	9,819		$	6,855