Defined Benefit Plan, Assumptions Used, Consumer Price Index Inflation Rate

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Defined Benefit Plan, Assumptions Used, Retail Price Index Inflation Rate

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Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Other Postretirement Benefit Obligation

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Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Other Postretirement Benefit Obligation, Net Insurance

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Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Other Postretirement Benefit Obligation

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Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Other Postretirement Benefit Obligation, Net Insurance

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Defined Benefit Plan, Life Expectancy Above Base

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Defined Benefit Plan, Life Expectancy Base

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Defined Benefit Plan, Long-term Rate Of Mortality Improvement Per Annum

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Defined Benefit Plans - Assumptions Used, Risk and Sensitivity Analysis (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2038	Dec. 31, 2028	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Expected rate of salary increase				0.80%	0.70%
Expected rate of salary increase				0.80%	0.70%
Discount rate				3.00%	3.60%
Discount rate				3.00%	3.00%
Return on plan assets				3.00%	3.60%
Retail price index inflation rate				3.00%	3.50%
Consumer price index inflation rate				2.10%	2.20%
CWSF and U.K. \| Discount rate
Defined Benefit Plan Disclosure [Line Items]
Impact 1.0% increase				$ (208)
Impact 1.0% increase, net				(92)
Impact 1.0% decrease					$ 258
Impact 1.0% decrease, net					120
CWSF and U.K. \| Inflation (and related increases)
Defined Benefit Plan Disclosure [Line Items]
Impact 1.0% increase				147
Impact 1.0% increase, net				72
Impact 1.0% decrease					(137)
Impact 1.0% decrease, net					(64)
CWSF and U.K. \| Life expectancy
Defined Benefit Plan Disclosure [Line Items]
Impact 1.0% increase				84
Impact 1.0% increase, net				$ 21
Impact 1.0% decrease					(82)
Impact 1.0% decrease, net					(21)
CWSF and U.K. \| Male participants and dependents
Defined Benefit Plan Disclosure [Line Items]
Life expectancy above base				27 years
CWSF and U.K. \| Male participants and dependents \| Forecast
Defined Benefit Plan Disclosure [Line Items]
Life expectancy above base		29 years	28 years
CWSF and U.K. \| Female participants
Defined Benefit Plan Disclosure [Line Items]
Life expectancy above base				28 years
CWSF and U.K. \| Female participants \| Forecast
Defined Benefit Plan Disclosure [Line Items]
Life expectancy above base		29 years	28 years
CWSF and U.K. \| Female dependents
Defined Benefit Plan Disclosure [Line Items]
Life expectancy above base				28 years
CWSF and U.K. \| Female dependents \| Forecast
Defined Benefit Plan Disclosure [Line Items]
Life expectancy above base		30 years	29 years
Other plans \| Discount rate
Defined Benefit Plan Disclosure [Line Items]
Impact 1.0% increase				$ (51)
Impact 1.0% decrease					63
Other plans \| Life expectancy
Defined Benefit Plan Disclosure [Line Items]
Impact 1.0% increase				$ 11
Impact 1.0% decrease					$ (10)
Unfunded Plan \| CWSF and U.K.
Defined Benefit Plan Disclosure [Line Items]
Long-term rate of mortality improvement	1.25%
Life expectancy base	60 years