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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Comprehensive Income      
Net Income $ 2,225 $ 2,022 $ 1,975
Other Comprehensive Items:      
Currency translation adjustment (net of tax benefit of $145, $0 and $0) 588 (566) (706)
Unrealized gains and losses on available-for-sale investments:      
Unrealized holding (losses) gains arising during the period (net of tax (benefit) provision of $0, $0 and $0) (1) (2) 1
Reclassification adjustment for (gains) losses included in net income (net of tax (provision) benefit of ($1), $0 and $0) (1) 1 0
Unrealized gains and losses on hedging instruments:      
Unrealized losses on hedging instruments (net of tax benefit of $0, $22 and $6) 0 (37) (9)
Reclassification adjustment for losses included in net income (net of tax benefit of $5, $4 and $2) 7 6 3
Pension and other postretirement benefit liability adjustments:      
Pension and other postretirement benefit liability adjustments arising during the period (net of tax provision (benefit) of $7, ($17) and ($5)) 23 (47) (9)
Amortization of net loss and prior service benefit included in net periodic pension cost (net of tax benefit of $5, $2 and $3) 17 6 8
Total other comprehensive items 633 (639) (712)
Comprehensive Income $ 2,858 $ 1,383 $ 1,263