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Employee Benefits - Amounts recognized in the Consolidated Statements of Financial Position (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Prepaid pension | $ 1,216 | $ 1,133
Pension Plan | U.S. |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Prepaid pension | 0 | 0
Accrued benefit liability - current | (50) | (46)
Accrued benefit liability - non-current | (1,076) | (1,035)
Accumulated other comprehensive loss | 1,763 | 1,708
Net amount recognized | 637 | 627
Pension Plan | U.K. |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Prepaid pension | 1,200 | 1,113
Accrued benefit liability - current | (1) | (1)
Accrued benefit liability - non-current | (19) | (16)
Accumulated other comprehensive loss | 1,244 | 1,136
Net amount recognized | 2,424 | 2,232
Pension Plan | Other |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Prepaid pension | 0 | 0
Accrued benefit liability - current | (5) | (5)
Accrued benefit liability - non-current | (117) | (111)
Accumulated other comprehensive loss | 454 | 433
Net amount recognized | $ 332 | $ 317

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