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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total Other comprehensive income (loss), net of tax $ (19) $ 115 $ (179) $ 357
Cumulative translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss), Pretax (38) 48 (216) 208
Total Other comprehensive income (loss), net of tax (38) 62 (222) 283
Retirement plans and other retiree benefits adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss), before reclassifications, Pretax 24 72 24 72
Reclassification from AOCI, Pretax 16 15 52 52
Other comprehensive income (loss), Pretax 40 87 76 124
Other comprehensive income (loss), before reclassifications, Net of Tax 18 45 18 45
Reclassification from AOCI, Net of Tax 13 9 41 34
Total Other comprehensive income (loss), net of tax 31 54 59 79
Cash flow hedges:        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss), before reclassifications, Pretax (2) (8) 4 (28)
Reclassification from AOCI, Pretax 0 4 8 2
Other comprehensive income (loss), Pretax (2) (4) 12 (26)
Other comprehensive income (loss), before reclassifications, Net of Tax (1) (5) 3 (17)
Reclassification from AOCI, Net of Tax 0 2 6 1
Total Other comprehensive income (loss), net of tax (1) (3) 9 (16)
Total Other comprehensive income (loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss), Pretax 0 131 (128) 306
Total Other comprehensive income (loss), net of tax $ (8) $ 113 $ (154) $ 346