Equity (Details 4) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension and post-employment benefits
Significant amounts reclassified out of each component of AOCI
Amortization of actuarial losses and other	$ 30	$ 16	$ 65	$ 32
Less tax benefit	(8)	(5)	(18)	(9)
Total reclassification, net of tax	22	11	47	23
Gains (losses) on hedging activities
Significant amounts reclassified out of each component of AOCI
(Gains) losses on designated cash flow hedges	(51)	24	(82)	36
Less tax expense	1		2
Total reclassification, net of tax	$ (50)	$ 24	$ (80)	$ 36