Financial Instruments and Fair Value Measures (Details 3) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Assets
Derivatives in asset position	$ 61	$ 211
Liabilities
Derivatives in liability position	208	243
Cumulative unrealized holding gains on available-for-sale equity securities	12	3
Fair value
Assets
Short term investments	151	145
Total assets	151	145
Liabilities
Total liabilities	31,027	15,254
Quoted prices in active markets for identical assets (Level 1)
Assets
Short term investments	64	68
Total assets	64	68
Liabilities
Total liabilities	30,911	14,715
Significant other observable inputs (Level 2)
Assets
Short term investments	18	13
Total assets	18	13
Liabilities
Total liabilities	116	539
Significant unobservable inputs (Level 3)
Assets
Short term investments	69	64
Total assets	69	64
Recurring | Fair value
Assets
Cash and equivalents	7,400	8,348
Equity securities	52	13
Total assets	8,374	8,581
Liabilities
Interest rate hedges	179	180
Total liabilities	208	243
Recurring | Fair value | Foreign Exchange Contract
Assets
Derivatives in asset position	61	211
Liabilities
Derivatives in liability position	29	63
Recurring | Fair value | Time deposits
Assets
Short term investments	861	9
Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets
Cash and equivalents	1,136	1,214
Equity securities	52	13
Total assets	1,188	1,227
Recurring | Significant other observable inputs (Level 2)
Assets
Cash and equivalents	6,264	7,134
Total assets	7,186	7,354
Liabilities
Interest rate hedges	179	180
Total liabilities	208	243
Recurring | Significant other observable inputs (Level 2) | Foreign Exchange Contract
Assets
Derivatives in asset position	61	211
Liabilities
Derivatives in liability position	29	63
Recurring | Significant other observable inputs (Level 2) | Time deposits
Assets
Short term investments	$ 861	$ 9