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Postretirement benefits Schedule of Allocation of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Short-term investments $ 3,016 $ 3,561
Available for sale, Fair Value 78,470 78,939
Equity Securities   937
Other Investments 5,277 4,672
Pension Plan [Member] | UNITED STATES    
Defined Benefit Plan Disclosure [Line Items]    
Short-term investments 84 61
Equity Securities 1,050 1,154
Defined benefit plan, fair value of plan assets excluding measured using NAV 2,290 2,432
Pension Plan [Member] | UNITED STATES | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Short-term investments 10 9
Equity Securities 1,050 1,154
Defined benefit plan, fair value of plan assets excluding measured using NAV 1,493 1,609
Pension Plan [Member] | UNITED STATES | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Short-term investments 74 52
Equity Securities 0 0
Defined benefit plan, fair value of plan assets excluding measured using NAV 797 823
Pension Plan [Member] | UNITED STATES | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Short-term investments 0 0
Equity Securities 0 0
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0
Pension Plan [Member] | Non-US [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Short-term investments 7 5
Equity Securities 474 614
Defined benefit plan, fair value of plan assets excluding measured using NAV 899 1,075
Pension Plan [Member] | Non-US [Member] | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Short-term investments 7 5
Equity Securities 103 122
Defined benefit plan, fair value of plan assets excluding measured using NAV 110 127
Pension Plan [Member] | Non-US [Member] | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Short-term investments 0 0
Equity Securities 371 492
Defined benefit plan, fair value of plan assets excluding measured using NAV 789 948
Pension Plan [Member] | Non-US [Member] | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Short-term investments 0 0
Equity Securities 0 0
Defined benefit plan, fair value of plan assets excluding measured using NAV 0 0
Pension Plan [Member] | US Treasury and Government [Member] | UNITED STATES    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 515 525
Pension Plan [Member] | US Treasury and Government [Member] | UNITED STATES | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 433 446
Pension Plan [Member] | US Treasury and Government [Member] | UNITED STATES | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 82 79
Pension Plan [Member] | US Treasury and Government [Member] | UNITED STATES | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 0 0
Pension Plan [Member] | Debt Security, Government, Non-US [Member] | UNITED STATES    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 641 692
Pension Plan [Member] | Debt Security, Government, Non-US [Member] | UNITED STATES | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 0 0
Pension Plan [Member] | Debt Security, Government, Non-US [Member] | UNITED STATES | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 641 692
Pension Plan [Member] | Debt Security, Government, Non-US [Member] | UNITED STATES | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 0 0
Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Non-US [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 418 456
Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Non-US [Member] | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 0 0
Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Non-US [Member] | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 418 456
Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Non-US [Member] | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Available for sale, Fair Value 0 0
Other Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Investments 95 15
Other Investments [Member] | Pension Plan [Member] | UNITED STATES    
Defined Benefit Plan Disclosure [Line Items]    
Other Investments 494 677
Other Investments [Member] | Pension Plan [Member] | Non-US [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Investments $ 109 $ 95