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Employee Benefit Obligations - Funded Status of Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Pension Plans      
Change in projected benefit obligation:      
Benefit obligation at prior year end $ 6,623 $ 2,009  
Service cost 66 72 $ 67
Interest cost 216 154 75
Benefits paid (412) (255)  
Recognized net actuarial loss (gain) (59) 297  
Curtailments and settlements including special termination benefits (265)    
Business acquisition   5,084  
Business divestiture   (440)  
Other 3 (8)  
Effect of exchange rates 321 (290)  
Benefit obligation at year end 6,493 6,623 2,009
Change in plan assets:      
Fair value of plan assets at prior year end 5,807 1,304  
Actual return on plan assets 404 146  
Employer contributions 183 296  
Contributions to unfunded plans 26 22  
Benefits paid 412 255  
Curtailment and settlement losses including special termination benefits (271)    
Business acquisition   4,888  
Business divestiture   (303)  
Other 2 (8)  
Effect of exchange rates 313 (283)  
Fair value of plan assets at end of year 6,052 5,807 1,304
Funded status (441) (816)  
Amounts recognized in accumulated other comprehensive income      
Net actuarial loss (575) (857)  
Net prior service (cost) credit (1) (11)  
Tax effect and currency exchange rates 214 278  
Accumulated other comprehensive earnings (loss) (362) (590)  
Benefit plans with an accumulated benefit obligation in excess of plan assets      
Projected benefit obligation 3,450 3,512  
Accumulated benefit obligation 3,381 3,452  
Fair value of plan assets 2,505 2,550  
Defined Benefit Pension Plans | U.S.      
Change in projected benefit obligation:      
Benefit obligation at prior year end 3,186 1,362  
Service cost 49 58 52
Interest cost 124 96 57
Benefits paid (222) (161)  
Recognized net actuarial loss (gain) 183 (47)  
Curtailments and settlements including special termination benefits (260)    
Business acquisition   1,888  
Other 1 (10)  
Benefit obligation at year end 3,061 3,186 1,362
Change in plan assets:      
Fair value of plan assets at prior year end 2,507 988  
Actual return on plan assets 224 (17)  
Employer contributions 174 111  
Contributions to unfunded plans 6 4  
Benefits paid 222 161  
Curtailment and settlement losses including special termination benefits (269)    
Business acquisition   1,592  
Other   (10)  
Fair value of plan assets at end of year 2,420 2,507 988
Funded status (641) (679)  
Amounts recognized in accumulated other comprehensive income      
Net actuarial loss (611) (585)  
Net prior service (cost) credit (1) (11)  
Tax effect and currency exchange rates 224 232  
Accumulated other comprehensive earnings (loss) (388) (364)  
Accumulated benefit obligation 2,996 3,130  
Benefit plans with an accumulated benefit obligation in excess of plan assets      
Projected benefit obligation 3,061 3,186  
Accumulated benefit obligation 2,996 3,130  
Fair value of plan assets 2,420 2,507  
Defined Benefit Pension Plans | Foreign      
Change in projected benefit obligation:      
Benefit obligation at prior year end 3,437 647  
Service cost 17 14 15
Interest cost 92 58 18
Benefits paid (190) (94)  
Recognized net actuarial loss (gain) (242) 344  
Curtailments and settlements including special termination benefits (5)    
Business acquisition   3,196  
Business divestiture   (440)  
Other 2 2  
Effect of exchange rates 321 (290)  
Benefit obligation at year end 3,432 3,437 647
Change in plan assets:      
Fair value of plan assets at prior year end 3,300 316  
Actual return on plan assets 180 163  
Employer contributions 9 185  
Contributions to unfunded plans 20 18  
Benefits paid 190 94  
Curtailment and settlement losses including special termination benefits (2)    
Business acquisition   3,296  
Business divestiture   (303)  
Other 2 2  
Effect of exchange rates 313 (283)  
Fair value of plan assets at end of year 3,632 3,300 316
Funded status 200 (137)  
Amounts recognized in accumulated other comprehensive income      
Net actuarial loss 36 (272)  
Tax effect and currency exchange rates (10) 46  
Accumulated other comprehensive earnings (loss) 26 (226)  
Accumulated benefit obligation 3,429 3,433  
Benefit plans with an accumulated benefit obligation in excess of plan assets      
Projected benefit obligation 389 326  
Accumulated benefit obligation 385 322  
Fair value of plan assets 85 43  
Other post retirement benefits      
Change in projected benefit obligation:      
Benefit obligation at prior year end 232 135  
Service cost 1 3 2
Interest cost 9 8 6
Benefits paid (22) (16)  
Recognized net actuarial loss (gain) 6 (18)  
Business acquisition   120  
Effect of exchange rates 1    
Benefit obligation at year end 220 232 $ 135
Rexam U K Pension Plan | Rexam      
Change in plan assets:      
Rexam escrow cash account   171  
Unfunded Plan | German, Swedish And U.S.      
Benefit plans with an accumulated benefit obligation in excess of plan assets      
Fair value of plan assets $ 0 $ 0