Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total Other comprehensive income (loss), net of tax	$ (24)	$ 70	$ 102	$ (269)
Cumulative translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), Pretax	(8)	64	86	(276)
Total Other comprehensive income (loss), net of tax	(37)	67	88	(285)
Retirement plans and other retiree benefits adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, Pretax	0	0	0	(1)
Reclassification from AOCI, Pretax	16	22	32	44
Other comprehensive income (loss), Pretax	16	22	32	43
Other comprehensive income (loss), before reclassifications, Net of Tax	0	0	0	(1)
Reclassification from AOCI, Net of Tax	12	14	23	28
Total Other comprehensive income (loss), net of tax	12	14	23	27
Available-for-sale securities:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, Pretax	0	(19)	0	(20)
Reclassification from AOCI, Pretax	0	7	0	7
Other comprehensive income (loss), Pretax	0	(12)	0	(13)
Other comprehensive income (loss), before reclassifications, Net of Tax	0	(12)	0	(13)
Reclassification from AOCI, Net of Tax	0	5	0	5
Total Other comprehensive income (loss), net of tax	0	(7)	0	(8)
Cash flow hedges:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, Pretax	7	(5)	(7)	1
Reclassification from AOCI, Pretax	2	(1)	0	(7)
Other comprehensive income (loss), Pretax	9	(6)	(7)	(6)
Other comprehensive income (loss), before reclassifications, Net of Tax	6	(3)	(4)	1
Reclassification from AOCI, Net of Tax	1	0	0	(4)
Total Other comprehensive income (loss), net of tax	7	(3)	(4)	(3)
Total Other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), Pretax	17	68	111	(252)
Total Other comprehensive income (loss), net of tax	$ (18)	$ 71	$ 107	$ (269)