Equity (Details 4) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension and post-employment benefits
Significant amounts reclassified out of each component of AOCI
Amortization of actuarial losses and other	$ 31	$ 27	$ 96	$ 59
Less tax benefit	(10)	(7)	(28)	(16)
Total reclassification, net of tax	21	20	68	43
Gains (losses) on hedging activities
Significant amounts reclassified out of each component of AOCI
(Gains) losses on designated cash flow hedges	(89)	23	(171)	59
Less tax expense			2
Total reclassification, net of tax	$ (89)	$ 23	$ (169)	$ 59