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Share-Based Compensation - Performance-Based and Restricted Stock Awards (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Additional Company Information [Abstract]
Vesting period	3 years
Minimum
Additional Company Information [Abstract]
Vesting period	1 year
PX Performance Based Awards
Additional Company Information [Abstract]
Vesting period	3 years
Awards to be settled in cash (in shares)	10,000
Unrecognized compensation expense	$ 42
Number of Shares (000’s)
Non-vested at beginning of period (in shares)	246,000
Granted (in shares)	224,000
Vested (in shares)	0
Cancelled and forfeited (in shares)	(33,000)
Non-vested at end of period (in shares)	437,000	246,000
Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 184.29
Granted (in dollars per share)	174.70
Vested (in dollars per share)	0
Cancelled and forfeited (in dollars per share)	178.27
Non-vested at end of period (in dollars per share)	$ 179.76	$ 184.29
Restricted Stock
Additional Company Information [Abstract]
Awards to be settled in cash (in shares)	12,000
Unrecognized compensation expense	$ 21
Number of Shares (000’s)
Non-vested at beginning of period (in shares)	884,000
Granted (in shares)	185,973
Vested (in shares)	(355,000)
Cancelled and forfeited (in shares)	(27,000)
Non-vested at end of period (in shares)	688,000	884,000
Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 129.43
Granted (in dollars per share)	174.95	$ 165.04	$ 144.86
Vested (in dollars per share)	117.62
Cancelled and forfeited (in dollars per share)	160.90
Non-vested at end of period (in dollars per share)	148.56	129.43
Performance Shares TSR
Average Grant Date Fair Value
Granted (in dollars per share)	198.61	215.85	$ 0
Performance Shares ROC
Average Grant Date Fair Value
Granted (in dollars per share)	$ 161.56	$ 168.47

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Cash-based Liability awards

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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-Section 50
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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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