Other Financial Data (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ (96)
Total other comprehensive income (loss), net of tax	(451)	$ (11)	$ 432
Balance at end of period	(952)	(96)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(266)	(204)	(96)
Other comprehensive income (loss) before reclassification adjustment	(227)	(82)	(58)
Tax benefit (expense)	(1)	20	9
Other comprehensive income (loss) before reclassification adjustment, net of tax	(228)	(62)	(49)
Reclassification adjustment	0	0	(75)
Tax expense (benefit)	0	0	16
Reclassification adjustment into earnings, net of tax	0	0	(59)
Total other comprehensive income (loss), net of tax	(228)	(62)	(108)
Balance at end of period	(494)	(266)	(204)
Derivative instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	0	0	(1)
Reclassification adjustment	0	0	1
Reclassification adjustment into earnings, net of tax	0	0	1
Total other comprehensive income (loss), net of tax	0	0	1
Balance at end of period	0	0	0
Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(3)	44	(2)
Other comprehensive income (loss) before reclassification adjustment	0	(15)	72
Tax benefit (expense)	0	5	(26)
Other comprehensive income (loss) before reclassification adjustment, net of tax	0	(10)	46
Reclassification adjustment	5	(61)	0
Tax expense (benefit)	(2)	24	0
Reclassification adjustment into earnings, net of tax	3	(37)	0
Total other comprehensive income (loss), net of tax	3	(47)	46
Balance at end of period	0	(3)	44
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(1,597)	(1,695)	(2,188)
Other comprehensive income (loss) before reclassification adjustment	(368)	108	(1,165)
Tax benefit (expense)	98	12	447
Other comprehensive income (loss) before reclassification adjustment, net of tax	(270)	120	(718)
Tax expense (benefit)	(8)	1	(732)
Reclassification adjustment into earnings, net of tax	44	(22)	1,211
Total other comprehensive income (loss), net of tax	(226)	98	493
Balance at end of period	(1,823)	(1,597)	(1,695)
Reclassification adjustment - Actuarial net losses into Selling, general, and administrative expenses
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment	53	71	118
Reclassification adjustment - Prior service benefits into Selling, general, and administrative expenses
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment	(27)	(62)	(57)
Reclassification adjustment - Non-U.S. pension curtailment gain into Other charges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment	0	(32)	0
Reclassification adjustment - Pension settlement loss into Other charges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment	26	0	1,883
Disposition of the Enterprise business retirement benefits into Earnings from discontinued operations, net of tax
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment	0	0	(1)
Total Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(1,866)	(1,855)	(2,287)
Total other comprehensive income (loss), net of tax	(451)	(11)	432
Balance at end of period	$ (2,317)	$ (1,866)	$ (1,855)