Retirement Benefits - Additional Information (Details)	1 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($) participant	Feb. 28, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Settlement loss			$ 359,000,000	$ 0	$ 48,000,000
Market-related asset valuation			5 years
Deferred compensation plan, employer percentage of matching			4.00%
Deferred compensation plan, maximum employer contribution for board officers			$ 50,000
Defined contribution plan, expenses for material defined contribution plans			32,000,000	31,000,000	28,000,000
Defined contribution plan, discretionary matching contributions made during period			$ 0	0	0
Minimum
Defined Benefit Plan Disclosure [Line Items]
Amortization period of prior service cost			2 years
Period range of amortizing gains and losses recognized			10 years
Maximum
Defined Benefit Plan Disclosure [Line Items]
Amortization period of prior service cost			5 years
Period range of amortizing gains and losses recognized			31 years
U.S.
Defined Benefit Plan Disclosure [Line Items]
Lump sum payout of plan assets	$ 836,000,000
Lump-sum election reduction in projected benefit obligation	1,000,000,000.0
Settlement loss			$ 359,000,000	0	0
Non U.S.
Defined Benefit Plan Disclosure [Line Items]
Settlement loss			$ 0	0	48,000,000
Pension Benefit Plans | U.S.
Defined Benefit Plan Disclosure [Line Items]
Years of service required			1 year
Settlement loss			$ 359,000,000	0	0
Amortization of unrecognized net loss and prior service cost for next fiscal year	58,000,000		58,000,000
Company contributions		$ 500,000,000	3,000,000	503,000,000
Net periodic pension cost			332,000,000	(27,000,000)	0
Actuarial present value of the future death benefits	$ 4,727,000,000		4,727,000,000	4,864,000,000	5,235,000,000
Pension Benefit Plans | Non U.S.
Defined Benefit Plan Disclosure [Line Items]
Voluntary lump-sum number of participants | participant	6,300
Settlement loss			0	0	48,000,000
Benefit obligation decrease			$ 83,000,000
Amortization period of prior service cost			29 years
Amortization of unrecognized net loss and prior service cost for next fiscal year	$ 12,000,000		$ 12,000,000
Company contributions			8,000,000	8,000,000
Net periodic pension cost			(32,000,000)	(36,000,000)	15,000,000
Actuarial present value of the future death benefits	1,814,000,000		1,814,000,000	1,654,000,000	1,844,000,000
Postretirement Health Care Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Settlement loss			$ 0	0	0
Retirement age			65 years
Maximum annual participant subsidy			$ 560
Amortization period of prior service cost			5 years
Amortization of unrecognized net loss and prior service cost for next fiscal year	11,000,000		$ 11,000,000
Company contributions			0	0
Net periodic pension cost			(18,000,000)	(19,000,000)	(20,000,000)
Actuarial present value of the future death benefits	73,000,000		73,000,000	72,000,000	85,000,000
Split-dollar Life Insurance Arrangement
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost			5,000,000	5,000,000	$ 5,000,000
Actuarial present value of the future death benefits	$ 67,000,000		$ 67,000,000	$ 61,000,000