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Other Financial Data - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period $ (952)    
Total other comprehensive loss, net of tax (245) $ (451) $ (11)
Balance at end of period (1,727) (952)  
Reclassification of stranded tax effects 270    
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period (494) (266) (204)
Other comprehensive income (loss) before reclassification adjustment 133 (227) (82)
Tax benefit (expense) 8 (1) 20
Total other comprehensive loss, net of tax 141 (228) (62)
Balance at end of period (353) (494) (266)
Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period 0 (3) 44
Other comprehensive income (loss) before reclassification adjustment 8 0 (15)
Tax benefit (expense) (2) 0 5
Other comprehensive income (loss) before reclassification adjustment, net of tax 6 0 (10)
Reclassification adjustment 0 5 (61)
Tax expense (benefit) 0 (2) 24
Reclassification adjustment into earnings, net of tax 0 3 (37)
Total other comprehensive loss, net of tax 6 3 (47)
Balance at end of period 6 0 (3)
Defined Benefit Plans      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period (1,823) (1,597) (1,695)
Other comprehensive income (loss) before reclassification adjustment (260) (368) 108
Tax benefit (expense) (213) 98 12
Other comprehensive income (loss) before reclassification adjustment, net of tax (473) (270) 120
Tax expense (benefit) (14) (8) 1
Reclassification adjustment into earnings, net of tax 81 44 (22)
Total other comprehensive loss, net of tax (392) (226) 98
Balance at end of period (2,215) (1,823) (1,597)
Reclassification adjustment - Actuarial net losses into Selling, general, and administrative expenses      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Reclassification adjustment 65 53 71
Reclassification adjustment - Prior service benefits into Selling, general, and administrative expenses      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Reclassification adjustment (18) (27) (62)
Reclassification adjustment - Non-U.S. pension curtailment gain into Other charges      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Reclassification adjustment 0 0 (32)
Reclassification adjustment - Non-U.S. pension settlement loss into Other charges      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Reclassification adjustment 48 26 0
Total Accumulated other comprehensive loss      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period (2,317) (1,866) (1,855)
Total other comprehensive loss, net of tax 25 (451) (11)
Balance at end of period (2,562) $ (2,317) $ (1,866)
Reclassification of stranded tax effects $ (270)