SHAREHOLDERS' INTEREST - Changes in amounts included in our cumulative other comprehensive income (loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Beginning balance	$ (1,558)	$ (1,179)
Other comprehensive income (loss) before reclassifications	1,156	(689)
Income taxes	(428)	262
Net other comprehensive income (loss) before reclassifications	728	(427)
Amounts reclassified from cumulative other comprehensive income (loss)(1)	219	68
Income taxes	(75)	(20)
Net amounts reclassified from cumulative other comprehensive income (loss)	144	48
Total other comprehensive income (loss)	872	(379)
Ending balance	(686)	(1,558)
Foreign currency translation adjustments
Beginning balance	413	411
Other comprehensive income (loss) before reclassifications	(59)	2
Income taxes	0	0
Net other comprehensive income (loss) before reclassifications	(59)	2
Amounts reclassified from cumulative other comprehensive income (loss)(1)	0	0
Income taxes	0	0
Net amounts reclassified from cumulative other comprehensive income (loss)	0	0
Total other comprehensive income (loss)	(59)	2
Ending balance	354	413
Unrealized gains on available-for-sale securities
Beginning balance	4	4
Other comprehensive income (loss) before reclassifications	2	0
Income taxes	0	0
Net other comprehensive income (loss) before reclassifications	2	0
Amounts reclassified from cumulative other comprehensive income (loss)(1)	0	0
Income taxes	0	0
Net amounts reclassified from cumulative other comprehensive income (loss)	0	0
Total other comprehensive income (loss)	2	0
Ending balance	6	4
Pension | Actuarial losses
Beginning balance	(1,942)	(1,674)
Other comprehensive income (loss) before reclassifications	1,123	(636)
Income taxes	(394)	249
Net other comprehensive income (loss) before reclassifications	729	(387)
Amounts reclassified from cumulative other comprehensive income (loss)(1)	221	175
Income taxes	(74)	(56)
Net amounts reclassified from cumulative other comprehensive income (loss)	147	119
Total other comprehensive income (loss)	876	(268)
Ending balance	(1,066)	(1,942)
Pension | Prior service credits (costs)
Beginning balance	(23)	(20)
Other comprehensive income (loss) before reclassifications	0	(11)
Income taxes	0	4
Net other comprehensive income (loss) before reclassifications	0	(7)
Amounts reclassified from cumulative other comprehensive income (loss)(1)	7	7
Income taxes	(3)	(3)
Net amounts reclassified from cumulative other comprehensive income (loss)	4	4
Total other comprehensive income (loss)	4	(3)
Ending balance	(19)	(23)
Other Postretirement Benefits | Actuarial losses
Beginning balance	(137)	(147)
Other comprehensive income (loss) before reclassifications	24	0
Income taxes	(7)	1
Net other comprehensive income (loss) before reclassifications	17	1
Amounts reclassified from cumulative other comprehensive income (loss)(1)	14	13
Income taxes	(5)	(4)
Net amounts reclassified from cumulative other comprehensive income (loss)	9	9
Total other comprehensive income (loss)	26	10
Ending balance	(111)	(137)
Other Postretirement Benefits | Prior service credits (costs)
Beginning balance	127	247
Other comprehensive income (loss) before reclassifications	66	(44)
Income taxes	(27)	8
Net other comprehensive income (loss) before reclassifications	39	(36)
Amounts reclassified from cumulative other comprehensive income (loss)(1)	(23)	(127)
Income taxes	7	43
Net amounts reclassified from cumulative other comprehensive income (loss)	(16)	(84)
Total other comprehensive income (loss)	23	(120)
Ending balance	$ 150	$ 127