Accrued Expenses And Other Payables (Details) - USD ($) $ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Unrealized losses on derivative contracts	$ 761		$ 464
Employee-related Liabilities	337		235
Accrued Income Taxes, Current	0		140
Accrual for Taxes Other than Income Taxes, Current	98		99
Reinsurance Payable	15		111
Liability for Claims and Claims Adjustment Expense	277		268
Contract with Customer, Liability	501	$ 519	519
Other accruals and payables	924		997
Total accrued expenses and other payables	$ 2,913	$ 2,826	$ 2,833