Postretirement Benefit Plans - Amounts Recognized on our Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	$ 96	$ 85
Accrued expenses and other liabilities & Deferred credits and other liabilities	(15)	(22)
Underfunded retirement plans	(129)	(196)
Funded status (FVPA – BO) at end of year	(48)	(133)
U.S. defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	66	51
Accrued expenses and other liabilities & Deferred credits and other liabilities	(9)	(16)
Underfunded retirement plans	(53)	(49)
Funded status (FVPA – BO) at end of year	4	(14)
U.S. retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	3	0
Accrued expenses and other liabilities & Deferred credits and other liabilities	0	0
Underfunded retirement plans	(3)	(22)
Funded status (FVPA – BO) at end of year	0	(22)
Non-U.S. defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Overfunded retirement plans	27	34
Accrued expenses and other liabilities & Deferred credits and other liabilities	(6)	(6)
Underfunded retirement plans	(73)	(125)
Funded status (FVPA – BO) at end of year	$ (52)	$ (97)