Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), start of period	$ (1,633)	$ (1,594)	$ (2,035)	$ (1,059)
Other comprehensive income (loss) before reclassifications	103	(261)	532	(824)
Amounts reclassified from accumulated other comprehensive (income) loss	3	(6)	(24)	22
Other comprehensive income (loss)	106	(267)	508	(802)
Accumulated other comprehensive income (loss), end of period	(1,527)	(1,861)	(1,527)	(1,861)
Foreign currency translation
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), start of period	(1,648)	(1,554)	(1,953)	(992)
Other comprehensive income (loss) before reclassifications	124	(235)	429	(797)
Amounts reclassified from accumulated other comprehensive (income) loss	13	0	13	0
Other comprehensive income (loss)	137	(235)	442	(797)
Accumulated other comprehensive income (loss), end of period	(1,511)	(1,789)	(1,511)	(1,789)
Pension and other postretirement benefits
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), start of period	29	(49)	(69)	(31)
Other comprehensive income (loss) before reclassifications	2	1	119	1
Amounts reclassified from accumulated other comprehensive (income) loss	(10)	(8)	(29)	(26)
Other comprehensive income (loss)	(8)	(7)	90	(25)
Accumulated other comprehensive income (loss), end of period	21	(56)	21	(56)
Derivative financial instruments
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), start of period	(49)	(73)	(50)	(119)
Other comprehensive income (loss) before reclassifications	(28)	(12)	(37)	(15)
Amounts reclassified from accumulated other comprehensive (income) loss	6	20	16	69
Other comprehensive income (loss)	(22)	8	(21)	54
Accumulated other comprehensive income (loss), end of period	(71)	(65)	(71)	(65)
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), start of period	35	82	37	83
Other comprehensive income (loss) before reclassifications	5	(15)	21	(13)
Amounts reclassified from accumulated other comprehensive (income) loss	(6)	(18)	(24)	(21)
Other comprehensive income (loss)	(1)	(33)	(3)	(34)
Accumulated other comprehensive income (loss), end of period	$ 34	$ 49	$ 34	$ 49