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Stockholders' Equity Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period     $ (8,073)  
Other comprehensive income (loss), net of tax $ (489) $ 195 49 $ 170
Balance at end of period (8,034)   (8,034)  
Foreign currency translation adjustments [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period (1,023) (661) (1,064) (614)
Other comprehensive income (loss), before reclassifications adjustment, net of tax (637) (79) (764) (133)
Reclassification adjustment, net of tax (8) 0 168 2
Other comprehensive income (loss), net of tax (645) (79) (596) (131)
Other comprehensive income (loss) attributable to noncontrolling interests, net of tax (2) 8 (10) 13
Balance at end of period (1,670) (732) (1,670) (732)
Defined benefit plans, net [Member]        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period (6,517) (2,477) (7,006) (2,501)
Other comprehensive income (loss), before reclassification adjustment - prior service cost or credit, net of tax (6) (3) (13) (30)
Other comprehensive income (loss) before reclassification adjustment - actuarial gains or losses, net of tax 91 257 439 238
Other comprehensive income (loss), before reclassifications adjustment, net of tax 85 254 426 208
Reclassification adjustment – prior service cost or credit, net of tax 2 4 9 14
Reclassification adjustment - actuarial losses, net of tax 67 22 208 82
Reclassification adjustment, net of tax 69 26 217 96
Other comprehensive income (loss), net of tax 154 280 643 304
Balance at end of period $ (6,363) $ (2,197) $ (6,363) $ (2,197)